MCQExams
0:0:1
CBSE
JEE
NTSE
NEET
Practice
Homework
×
CBSE Questions for Class 11 Medical Biology Digestion And Absorption Quiz 3 - MCQExams.com
CBSE
Class 11 Medical Biology
Digestion And Absorption
Quiz 3
Deoxyribonuclease and ribonuclease are secreted by
Report Question
0%
Liver
0%
Stomach
0%
Pancreas
0%
Kidney
Explanation
Deoxyribonuclease and ribonuclease are the nucleases which catalyze the degradation of DNA and RNA respectively. They bring about the hydrolytic cleavage of phosphodiester bonds. These enzymes are present in the digestive juice and are secreted by
acinar cells of the
pancreas
in their active forms
along with other enzymes such as lipase and amylase.
Thus, the correct answer is option C.
Which of the following belongs to the class of pepsin and trypsin?
Report Question
0%
Rennin
0%
Sucrose
0%
Thyroxin
0%
Secretin
Explanation
Pepsin, rennin and trypsin are digestive enzymes.
Pepsin and renin are enzymes secreted by the gastric pits in the stomach. They are the active forms of pepsinogen and prorenin respectively, which activate when they come into contact with the hydrochloric acid in the stomach.
Trypsin is the active form of trypsinogen, secreted by the pancreas into the duodenum, which is activated by enterokinase secreted by the cells of the small intestine. Hence, Rennin belongs to the class of pepsin and trypsin.
So, the correct answer is 'rennin'.
Which of the following digest proteins into peptides?
Report Question
0%
Erepsin
0%
Rennin
0%
Pepsin
0%
Lipase
Explanation
Pepsin is an enzyme whose zymogen (pepsinogen) is released by the chief cells in the stomach and degrades proteins into peptides.
In vertebrates, lacteals are found in
Report Question
0%
Ileum
0%
Ischium
0%
Oesophagus
0%
Ear
Explanation
Lacteals are lymphatic vessels found in small intestinal villi. While other nutrients such as amino acids and saccharides are absorbed into the blood stream,
lacteals
absorb
fat.
Occurring in the fingerlike villi of the ileum, lacteals have a milky appearance and drain into the lymphatic system. Before fat can pass into the lacteal, bile from the liver causes its emulsification into small droplets for attack by the enzyme lipase.
So, the correct answer is option A.
The process by which digested food of the alimentary canal passes through its mucous membrane into circulatory system is called
Report Question
0%
Absorption
0%
Assimilation
0%
Hydrolysis
0%
Defecation
Explanation
Absorption is the process by which the nutrients in food are passed on to the blood.
Absorption occurs by the villi, small bristle-like protrusions in the mucosa.
Thus, the correct answer is option A.
Digestion is the conversion of large molecules into small ones. This is due to
Report Question
0%
Better taste
0%
More saliva
0%
Enzymatic action
0%
More Stomach acid
Explanation
Digestion is the breakdown of food by digestive enzymes into smaller components that can be more easily absorbed and assimilated by the body. These smaller substances are absorbed through the small intestine into the blood stream.
Emulsified fat is digested by
Report Question
0%
Lipase
0%
Lipase and hydrolase
0%
Bile salts
0%
Bile pigments
Explanation
Before fat can pass into the lacteal, bile from the liver causes its emulsification into small droplets for activation by the enzyme lipase, secreted by pancreatic juice.
Which one of the following is the correct matching of the site of action on the given substrate, the enzyme acting upon it and the end product?
Report Question
0%
Small intestine : $$\rightarrow $$ Proteins Pepsin Amino acids
0%
Stomach : $$\rightarrow $$ Fats Lipase Micelles
0%
Duodemum : $$\rightarrow $$ Triglycerides Trypsin Monoglycerides
0%
Small intestine : $$\rightarrow $$ Starch Amylase Disaccharide (Maltose)
Explanation
Amylase digests complex starch (polysaccharide) molecules into smaller, simpler maltose (disaccharide) molecules.
If pancreas is removed, which of the following compounds remain undigested?
Report Question
0%
Carbohydrates
0%
Fats
0%
Proteins
0%
All of the above
Explanation
The pancreatic enzymes have following functions:
1. Amylase digests the remaining complex carbohydrates into sugars by maltase, sucrase and lactase
2. Trypsin, chymotrypsin, and elastase all digest proteins
3. Lipase digests triglycerides into fatty acids and monoglycerides.
Hence without pancreas digestion cannot take place.
Sacculus rotundus is present in
Report Question
0%
Duodenum of rabbit
0%
Ileum of frog
0%
Ileum of rabbit
0%
Colon of rabbit
Explanation
The sacculus rotundus is the structure present at the terminal end of the ileum of the rabbit. It is rich in lymphoid tissues. It helps in digestion and provides immunity to the rabbit.
So, the correct answer is option C.
Trypsin is related with digestion of
Report Question
0%
Carbohydrates
0%
Proteins
0%
Fat
0%
None of the above
Explanation
Trypsin is a serine protease produced in the pancreas. It catalyzes the hydrolysis of peptide bonds of proteins, breaking down into smaller peptides
Some proteolytic enzymes are
Report Question
0%
Trypsin, erepsin, pepsin
0%
Amylopsin, steapsin, protease
0%
Amylase, lipase, zymase
0%
Urease, zymase, dehydrogenase
Explanation
Trypsin is a serine protease produced in the pancreas. It catalyzes the hydrolysis of peptide bonds, breaking down into smaller peptides. Erepsin is a protein found in intestinal juices and contains the group of enzymes that digest peptones into amino acids.
Pepsin is an enzyme present in the stomach. It degrades food proteins into peptides.
Alpha 1, 4, glycosidic bonds are broken when
Report Question
0%
Lipid is digested by lipase
0%
Protein is digested by pepsin
0%
Starch is digested by amylase
0%
None of the above
Explanation
Starch is a polymeric carbohydrate made up of large number of glucose units that are joined together by glycosidic bonds.
Amylase is an enzyme that digest carbohydrates. It is secreted by the salivary gland. It acts on the
alpha-1, 4-glycosidic linkages
of alpha-linked polysaccharides, such as starch and glycogen to yield oligosaccharides.
Thus, the correct answer is option C.
Trypsin a digestive enzyme occurs in which part of GI tract, acts on and works in which condition
Report Question
0%
Starch in buccal cavity in an alkaline medium
0%
Protein in stomach in an acidic medium
0%
Protein in duodenum in an acidic medium
0%
Protein in duodenum in an alkaline medium
Explanation
Trypsin is a serine protease found in the digestive system of many vertebrates, where it hydrolyzes proteins.
Trypsin is the active form of trypsinogen, secreted by the pancreas into the duodenum, which is activated by enterokinase secreted by the cells of the small intestine.
In the duodenum, trypsin catalyzes the hydrolysis of peptide bonds, breaking down proteins into smaller peptides which occurs in the small intestine where a slightly alkaline environment (about pH 8). Hence, Trypsin a digestive enzyme secreted by the pancreas and works in the alkaline medium.
So, the correct answer is 'Protein in the duodenum in an alkaline medium'.
Part of the stomach which opens into the duodenum is
Report Question
0%
Cardiac
0%
Pylorus
0%
Fundus
0%
Body
Explanation
The pylorus is a narrow cone shaped constriction present at the end of the stomach and the beginning of the small intestine. It contains two region antrum which connects the parts of the stomach and pyloric canal which connects the stomach and small intestine. Thus, the correct answer is option B.
If pH of a protein is 1.6, which enzyme will digest it?
Report Question
0%
Trypsin
0%
Pepsin
0%
Amylase
0%
Erepsin
Explanation
All the enzymes are affected by changes in pH. The enzymes work optimally at the particular pH. This pH is known as the optimum pH. The pH above or below the optimum pH will affect the enzyme activity.
The optimum pH of trypsin is 7.8 -8.7.
The optimum pH of pepsin is 1.5 -1.6.
The optimum pH of amylase is 6.7 -7.
The optimum pH of erepsin is around 8.
Thus, the correct answer is option B.
Milk protein is curdled into calcium paracaseinate by
Report Question
0%
Maltase
0%
Rennin
0%
Trypsin
0%
Lactase
Explanation
In young mammals, milk protein caseinogen is digested with the help of an enzyme called rennin. Prorennin is converted into active rennin in the presence of HCl. Rennin curdles milk protein caseinogens, which is hydrolyzed into casein. Rennin converts casein into solid calcium paracaseinate in presence of Ca$$^{++}$$, so that pepsin can reduce it to peptones. Hence, the correct answer is B.
Ptyalin acts upon
Report Question
0%
Fats
0%
Proteins
0%
Lipids
0%
Starch
Explanation
Ptyalin is a form of amylase in the saliva of humans and some animals that catalyze the hydrolysis of starch into maltose and dextrin.
Pepsin acts on
Report Question
0%
Fats
0%
Proteins
0%
Carbohydrates
0%
Glucose
Explanation
Pepsin is an enzyme present in stomach. It degrades food proteins into peptides.
Digestion of carbohydrate is affected by
Report Question
0%
Erepsin
0%
Steapsin
0%
Pepsin
0%
Less amount of amylase
Explanation
Erepsin is found in the intestinal juices and contains group of enzymes that digest peptones into amino acids.
Steapsin is found in the pancreatic juices and is a type of lipase which catalyzes the hydrolysis of triglycerides to fatty acids and glycerol.
Pepsin is an enzyme produced by stomach and is involved in the breaks down of proteins into smaller peptides.
Amylase is an enzyme secreted by mouth as well as pancreas. It helps in digestion of carbohydrates.
Thus, the correct option is option D.
Which one of the following is the matching pair of digestive enzyme and substrate?
Report Question
0%
Rennin - Protein
0%
Amylase - Lactose
0%
Trypsin - Starch
0%
Invertase - Maltose
Explanation
In young mammals, milk protein caseinogens are digested with the help of an enzyme, called rennin. It converts prorennin into active rennin in the presence of HCl. Rennin curdles milk protein caseinogens, which is hydrolyzed into casein. Rennin converts casein into solid calcium paracaseinate in presence of Ca$$^{++}$$ so that pepsin can reduce it to peptones.
Which of the following is not present in pancreatic juice?
Report Question
0%
Trypsinogen
0%
Chymotrypsin
0%
Pepsin
0%
Lipase
Explanation
Pancreatic juice is secreted by the pancreas, which contains a variety of enzymes, including trypsinogen, chymotrypsinogen, elastase, carboxypeptidase, pancreatic lipase and amylase. Pepsin in not present in pancreatic juice. It is secreted by the peptic cells of the stomach.
Which one of the following will not take place when glucose is taken as food?
Report Question
0%
Ingestion
0%
Digestion
0%
Absorption
0%
Assimilation
Explanation
Glucose and galactose are taken into the enterocyte by co-transport with sodium. Hence, if we have straight glucose, it can absorb directly into the bloodstream without further digestion.
Rennin acts on milk proteins and converts
Report Question
0%
Caseinogen into casein
0%
Casein into paracasein
0%
Caseinogen into paracasein
0%
Paracasein into carcinogen
Explanation
Rennin is a proteolytic enzyme found in gastric juice of infants.
This enzyme causes coagulation of milk and is important in the digestive processes of infants because it prevents the rapid passage of milk from the stomach.
In the presence of calcium, rennin changes irreversibly the casein of milk to a paracasein which is then acted upon by pepsin. Hence, Rennin acts on milk proteins and converts Casein into paracasein.
So, the correct answer is 'Casein into paracasein'.
Lacteals are found in
Report Question
0%
Liver
0%
Lungs
0%
Kidney
0%
Villus of intestine
Explanation
Lacteals are lymphatic vessels found in small intestinal villi. While other nutrients such as amino acids and saccharides are absorbed into the blood stream,
lacteals
absorb
fat.
Occurring in the fingerlike villi of the ileum, lacteals have a milky appearance and drain into the lymphatic system. Before fat can pass into the lacteal, bile from the liver causes its emulsification into small droplets for attack by the enzyme lipase.
So, the correct answer is option D.
Salivary amylase is stimulated by
Report Question
0%
$$K^{+}$$
0%
$$N^{+}$$
0%
$$HCO_{3}^{-}$$
0%
$$Cl^{-}$$
Explanation
Salivary amylase is secreted by the salivary glands in the mouth. This enzyme is involved in partial digestion of carbohydrates. The carbohydrates in food are broken down to maltose. Maltose is further digested into glucose in the small intestine. The chloride ion is involved in the allosteric activation of salivary amylases by binding at the allosteric site of amylase. Thus the correct answer is option D.
In the human digestive system maltase converts
Report Question
0%
Maltose to glucose at pH greater than 7
0%
Maltose to glucose at pH less than 7
0%
Maltose to alcohol
0%
Starch to maltose at higher pH than 7
Explanation
Enzymes in saliva convert starch into glucose. Amylase catalyzes starch to maltose; maltase catalyzes maltose to glucose. The enzymes in the small intestine work best in alkaline conditions. So, the pH of the intestine is slightly basic, i.e., 7.
So, option A is correct here.
Ptyalin is inactivated by a component of gastric juice known as
Report Question
0%
Pepsin
0%
Mucus
0%
Rennin
0%
HCl
Explanation
The low pH in the stomach stops starch digestion because ptyalin (salivary amylase) , an enzyme to hydrolyze starch (carbohydrates) is active only when the pH is about 6.8 to 7 (in the mouth). A gastric gland in stomach secrets juice contains HCl which make stomach acidic. Hence ptyalin is inactive in the stomach, thereby stopping starch digestion.
Just as hydrochloric acid : Pepsinogen so is
Report Question
0%
Enterokinase : Trypsinogen
0%
Haemoglobin : Oxygen
0%
Bile juice : Fat
0%
Glucagon : Glycogen
Explanation
Correct option: A
Explanation:
In the stomach, gastric cells secrete
pepsinogen (precursor to pepsin), it gets
activated by hydrochloric acid into pepsin
, Pepsin breaks down proteins into smaller peptides.
Likewise, Enterokinase is an enzyme produced by duodenum cells, which
converts trypsinogen into active form of trypsin.
Trypsin in turn activates other pancreatic enzymes. It is similar to the activation of pepsin. Option A is correct.
Haemoglobin is a protein found in blood which binds to four oxygen molecules for transportation of oxygen in the cells.
Bile juice is produced in liver. it breaks down fats into fatty acids, which gets absorbed in the gut.
Glucagon is produced by pancreas, which increase blood sugar levels in the body. Glycogen is a polysaccharide of glucose that serves as a form of energy storage in animals. It is produced and stored in liver.
Thus, Option A is correct.
In ileum which of the following is absorbed?
Report Question
0%
Vitamin K
0%
Bile salt
0%
Glucose
0%
Fat
Explanation
The small intestine is the site for digestion as well as absorption of food. The absorption of the majority of nutrients takes place in the jejunum but iron is absorbed in the duodenum. Vitamin B12 and bile salts are absorbed in the terminal ileum. After the digestion of fat, bile salts is absorbed by the ileum of small intestine and fats are absorbed by the lacteal.
Bile salts act as activator of which of the following enzyme?
Report Question
0%
Pepsinogen
0%
Trypsinogen
0%
Lipase
0%
Pancreatic amylase
Explanation
Bile salts are released by the liver in the small intestine which activates the lipase for fat digestion. It emulsify fat globules into smaller micelles, increasing the surface area accessible to lipid hydrolyzing enzymes. The bile salts also help to solubilize lipid breakdown products (e.g., mono and diacylglycerols formed from hydrolysis of triacylglycerols).
The above scheme is showing the fate of carbohydrates during digestion in the human alimentary canal. Identify the enzymes acting at stages indicated as A, B, C and D. Choose the best option from those given below.
Report Question
0%
$$A= amylase, B = maltase, C = lactase , D = invertase $$
0%
$$A= amylase, B = maltase, C = invertase, D = lactase $$
0%
$$A= amylase, B = invertase, C = maltase, D = lactase $$
0%
$$A= amylase, B = lactase, C = maltase, D = invertase $$
Explanation
Amylase is an enzyme that breaks starch into sugar. Amylase is present in human saliva, where it begins the chemical process of digestion. Lactase is an enzyme produced by the small intestine, found in the digestive system of humans. Lactase is essential for the complete digestion of whole milk. Maltase catalyzes the hydrolysis of maltose to the simple sugar glucose. This enzyme is found in plants, bacteria, and yeast. Invertase hydrolyzes sucrose to give the mixture of glucose and fructose.
Gastric folds observed when the stomach is empty are known as ___________ .
Report Question
0%
Fiveoles
0%
Ancinura angularis
0%
Rugae
0%
None
Which of the following carries glucose from the digestive tract to the liver?
Report Question
0%
Hepatic artery
0%
Pulmonary vein
0%
Hepatic portal vein
0%
Renal portal system
Explanation
The blood that comes from the
digestive tract contains absorbed food like glucose and
amino acids; it is carried
to the liver through the
hepatic portal vein.
The folds of Kerkring are developed in
Report Question
0%
Duodenum
0%
Jejunum
0%
Ileum
0%
Large intestine
Explanation
The entire small intestine has circular folds of the
mucous membrane, the valves' of kerkring These folds
are more prominent in the jejunum.
Taeniae are found in
Report Question
0%
Small intestine
0%
Stomach
0%
Large Intestine
0%
All of the above
Explanation
In the wall of caecum and colon, the longitudinal muscle
layer is thickened along three lines, forming the taeniae.
Assertion : The main part of carbohydrate digestion
takes place in small intestine.
Reason : Here pancreatic amylase converts
carbohydrates into lactose
Report Question
0%
If both the assertion and the reason are true and the reason
is a correct explanation of the assertion
0%
If both the assertion and reason are true but the reason is
not a correct explanation of the assertion
0%
If the assertion is true but the reason is false
0%
If both the assertion and reason are false
0%
If the assertion is false but reason is true
Explanation
In small intestine Pancreatic amylase converts starch
and dextrose into maltoses and small intestine is main
site for digestion of carbohydrates.
Assertion : Starch is hydrolyzed by protease to maltose.
Reason : Sucrase hydrolyzes sucrose to lactose.
Report Question
0%
If both the assertion and the reason are true and the reason
is a correct explanation of the assertion
0%
If both the assertion and reason are true but the reason is
not a correct explanation of the assertion
0%
If the assertion is true but the reason is false
0%
If both the assertion and reason are false
0%
If the assertion is false but reason is true
Explanation
Starch is hydrolyzed by pancreatic amylase to maltose,
isomaltose and dextrose sucrose $$\overset{suctase}{\rightarrow}$$ glucose
and fructose.
Which of the following sugars is absorbed from the small
intestine by facilitated diffusion
Report Question
0%
Fructose
0%
Glucose
0%
Sucrose
0%
Lactose
Explanation
Glucose and gala dose are absorbed by active transport.
Fructoseis absorbed by facilitated diffusion.
Wisdom teeth in human is
Report Question
0%
$$3^{rd}$$molar and 4 in number
0%
$$3^{rd}$$ molar and 2 in number
0%
$$2^{nd}$$molar and 4 in number
0%
$$2^{nd}$$ molar and 2 in number
Explanation
In the permanent dentition of a human, there are normally 28 teeth before his/her twenties that include 8 incisors, 4 canines, 8 premolars, and 8 molars.
Wisdom teeth (4 in number) are the third and final set of molars that most people get in their late teens or early twenties.
After which the number of molars will be 12 while the total number of teeth will be 32.
So, the correct answer is option A.
Disaccharide which gives two molecules of glucose is ____________.
Report Question
0%
Lactose
0%
Sucrose
0%
Maltose
0%
Galactose
Explanation
Maltose is composed of two molecules of glucose.
So, the correct answer is '
Maltose'
If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected?
Report Question
0%
Proteins breaking down into amino acids.
0%
Starch breaking down into sugars.
0%
Fats breaking down into fatty acids and glycerol.
0%
Absorption of vitamins.
Explanation
Hint -
Digestion of food starts from the mouth itself because of the presence of salivary amylase in saliva.
Part 1 - Structure of starch
Starch is a heteropolysaccharide made up of two chains - Amylose and Amylopectin.
Amylose is made up of straight-chain polymer of $$\alpha-$$D Glucose and Amylopectin is made up of branched-chain polymer of $$\alpha-$$D Glucose.
Part 2 - Action of Salivary amylase
The salivary amylase is secreted by the salivary glands (like - Parotid gland, Sublingual gland, and Sub-maxillary gland).
It acts on the $$\alpha 1\rightarrow4$$ linkage present in amylose and amylopectin.
Thus, break the starch by producing small chain polysaccharides and disaccharides like $$\alpha$$-Dextrin and Maltose.
Part 3 - Conclusion
Salivary amylase cannot act upon the breakdown of proteins, fats, and the absorption of vitamins.
Salivary amylase can only digest the starch into smaller sugar molecules.
Thus, if salivary amylase is not present in the saliva then the starch digestion in the mouth would not take place.
Final step - If salivary amylase is lacking in the saliva, only starch breakdown will be affected.
The colour of the faeces is due to the
Report Question
0%
Urochrome
0%
Stercobilin
0%
Biliverdin
0%
Bacteria
Which among the following protects the lining of the stomach from hydrochloric acid?
Report Question
0%
Pepsin
0%
Mucus
0%
Salivary amylase
0%
Bile
Explanation
The stomach wall has gastric glands that secrete gastric juice, which is a mixture of enzymes, HCl, and mucus. The stomach wall is always covered by a layer of thick mucus that serves two purposes. One is the lubrication of food masses in order to facilitate movement within the stomach. The other function is to form a protective
layer over the epithelium lining of the stomach wall. This mucus layer prevents the lining of the stomach wall from the acidic environment, created by HCl.
So, the correct answer is option B.
Lamina propria is related with
Report Question
0%
Human intestine
0%
Liver of human being
0%
Graafian follicle
0%
Acinus of pancreas
In which part of the alimentary canal, food is finally digested?
Report Question
0%
Stomach
0%
Mouth cavity
0%
Large intestine
0%
Small intestine
Explanation
Hint:
Digestion starts from the mouth itself just after ingestion of food and continues throughout in the different organs of the alimentary canal sequentially until it finally reaches the large intestine where only absorption takes place after which undigested food will be egested through the anus.
Part 1 - Definition - Human digestive system
In the human digestive system, there are many parts that work together to convert the food we eat into simpler forms so that your body can absorb it.
The human digestive system includes the gastrointestinal tract and other accessory parts like the liver, intestines, glands, mouth, stomach, gallbladder.
There are 6 primary functions of the human digestive system process: Ingestion, Motility, Secretion, Digestion, Absorption, Excretion.
Part 2 - Parts of the Digestive system
The different organs of the alimentary canal can be explained as –
Mouth
-
The starting point where digestion actually starts is the mouth with the help of saliva.
From the mouth, food enters the Oesophagus.
Oesophagus
-
It is a long and thin muscular tube that passes through the neck, thorax, and diaphragm and opens into a muscular bag-like structure called the stomach.
Stomach
- It is a muscular, hollow organ, having a capacity of 1 litre. The stomach holds food and also is a mixer and grinder.
Small Intestine
- The longest part of the alimentary canal, which is divided into three parts- Duodenum, Jejunum, and Ileum. The ileum opens into the large intestine. Maximum digestion and absorption take place here.
Large Intestine
- It is a wide tube consists of three parts- Caecum, Colon, and Rectum. The colon is divided into four regions-ascending colon, transverse colon, descending colon, and the sigmoid colon. Through the sigmoid colon, the descending part of the colon opens into Rectum. The rectum is the distal part of the alimentary canal that opens into the anus.
Part 3 - Process of digestion
The digestion process is a series of reactions of food with the digestive hormones and juices. This starts right from the oral cavity.
When food is taken in through the mouth along with chewing and mixing, the chemical breakdown of carbohydrates because of the action of saliva from the salivary glands also takes place.
When food reaches the stomach through the oesophagus, it gets mixed thoroughly with the gastric juices through the churning movements of the stomach muscle.
This mass of food that is semi-digested, acidic, and pulpy is called the chyme.
It is mostly the proteins that get digested in the stomach through the action of pepsin.
In the small intestine, further digestion takes place. There are many enzymes that are secreted into the small intestine from organs such as the pancreas, liver; apart from the intestinal juices.
All these react with the food particles and digest them into smaller particles that can be absorbed into the bloodstream.
Any undigested and unabsorbed waste particles, called the fecal matter, are then passed to the rectum, from where it is eliminated through the anus.
Part 4 - Conclusion
From the above discussion, we can conclude that digestion starts within the oral cavity and continues until it reaches the small intestine where final digestion and absorption take place.
We excrete undigested fecal matter after final absorption in the large intestine through the anus.
Final step
: Small intestine is the part of the alimentary canal where food is finally digested.
Which of the following is a substrate of trypsin?
Report Question
0%
Protein
0%
Fat
0%
Carbohydrate
0%
Amino acid
Explanation
Trypsin is a protein-splitting enzyme, produced in the pancreas as an inactive protease trypsinogen. When it is secreted in the small intestine, it is activated by the intestinal enteropeptidase. Activated trypsin catalyses proteins into smaller peptides.
Therefore, the correct answer is option A.
Smooth muscles are likely to be found in
Report Question
0%
Muscles of legs
0%
Muscles of arms
0%
Stomach
0%
Heart
Carbohydrates are not digested in
Report Question
0%
Buccal cavity
0%
Intestine
0%
Stomach
0%
Duodenum
Explanation
The starch is digested in mouth by chewing and the action of the amylase. Amylase works in the pH of 6.8. whereas the pH in stomach is 2. Amylase cannot work under such pH and there is no other enzyme to digest starch in the stomach, except pepsin and rennin, that are concerned with protein digestion.
Which is the first enzyme to mix with food in the digestive tract?
Report Question
0%
Pepsin
0%
Cellulase
0%
Amylase
0%
Trypsin
Explanation
Hint
: The process of digestion begins in the mouth with the intake of food.
Part 1 - Definition - Human digestive system
In the Human digestive system, there are many parts that work together to convert the food we eat into simpler forms so that your body can absorb it.
This process of converting complex food substances (molecules) into simpler forms to facilitate absorption is called Digestion.
These bio-macromolecules are the building blocks that we require to maintain our body.
Part 2 - Parts of the digestive system
The starting point where digestion actually starts is the mouth.
From the mouth, it passes through the alimentary canal, which is also called the gastrointestinal tract.
This tract consists of the pharynx, esophagus, stomach, small intestine, large intestine, and anus.
Part 3 - Process of Digestion
The whole process starts in the oral cavity, where the saliva from the salivary glands mixes with the food.
Salivary amylase present in the saliva helps in the breakdown of starch into maltose. Salivary amylase is also called ptyalin.
From the mouth, the food passes to the hollow tube-like organ the esophagus, and then travels to the stomach, where it breaks down further with the help of the acids and powerful enzymes secreted by the stomach.
This semi-digested food then travels down to the small intestine, where secretions from the liver, gallbladder, and pancreas further act on the food particles.
Final digestion and absorption occur in the small intestine.
The fecal matter from the large intestine comes out through the anus.
Part 4 - Conclusion
From the above discussion, we can conclude that saliva secreted by salivary glands contains the enzyme that will first act on the undigested food.
Final step
: The first enzyme to mix with food in the digestive tract is salivery amylase.
0:0:1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
0
Answered
0
Not Answered
0
Not Visited
Correct : 0
Incorrect : 0
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Practice Class 11 Medical Biology Quiz Questions and Answers
<
>
Support mcqexams.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page
