Pepsinogen is activated by:
Trypsin
Chymotrypsin
HCl
Na+
Pepsin converts:
Protein into amino acid
Fat into fatty acid
Peptones into amino acid
Proteins into proteoses and peptones (peptides)
Three secretions meeting the food in small intestine are:
Bile, gastric juice and saliva
Bile, pancreatic juice and gastric juice
Pancreatic juice, intestinal juice and gastric juice
Bile, pancreatic juice and succus entericus
The mastication of food is carried out by
Enamel
Teeth
Only incisors
Molars
Trypsinogen, chymotrypsinogen, procarboxypeptidase, amylase, lipase and nuclease enzymes are found in:
Pancreatic juice
Succus entericus / intestinal juice
Gastric juice
Bile and gastric juice
Bile produced in the liver is associated with which of the following?
Emulsification of fats into tiny globules (micelles) in the small intestine by bile salts
Digestive action of pancreatic amylase
Emulsification of fats into tiny globules in the stomach
Digestion of proteins into amino acids
Waves of muscle contraction that move the intestinal content are:
Caused by-contraction of skeletal muscle
Regulated by liver secretions
Called peristalsis
Voluntary
Bile aids in digestion and absorption of fats because it contains:
Lipase
Bile salts
Bile pigments
All of the above
Emulsification of fat is carried out by:
Aminopeptidase, a digestive enzyme produces:
Tripeptidases
Smaller peptides
Peptones
Amino acids
Optimum pH for enzyme trypsin is:
5.9
4.6
8.5
7.0
The intestinal mucosal epithelium has goblet cells which secretes:
Digestive enzymes
Intestinal digestive enzymes
Mucus
Succus intericus
The secretion of the brush border cells along with secretions of goblet cells of present in mucosa of small intestine constitutes:
Chyme
Chyle
Succus entericus
Interstitial fluid
The undigested substance (faeces) enter into the ________ of large intestine through ________ valve which prevents backflow of faecal matter:
Caecum, ileo-caecal
Colon, ileo-colon valve
Rectum, Recto-colonic
Colon, pyloric valve
In addition to neural control, hormones also influence the:
Gastric secretions
Intestinal secretions
Muscular activities of different parts of alimentary canal
All are correct
Fructose and some amino acids are absorbed by:
Active transport
Diffusion
Facilitated transport
Osmosis
Which of the following statement is wrong about chylomicrons?
I. Chylomicrons are produced in the epithelial cells of small intestine
II. It contains triglycerides, cholesterol and phospholipids
III. It is protein coated small vesicles
IV. Chylomicrons released from the epithelial cell into lacteals
I and IV
II and III
I, II, III and IV
None of the above
Gastric juice does not contain:
Rennin
Protease
Amylase
Enterokinase is:
A hormone that prevents the secretion of gastric juice
An enzyme that activates the enzyme of pancreatic juice
An enzyme that activates the proteolytic enzymes of succus entericus
Hormone that prevents the secretion of pancreatic juice
The sphincter of Oddi is present between:
Oesophagus and cardiac stomach
Pyloric stomach and duodenum
Hepatic duct and cystic duct
Hepatopancreatic duct and duodenum
If for some reason the parietal cells of the gastric epithelium become partially non-functional, what is likely to happen?
The pancreatic enzymes and specially the trypsin and lipase will not work efficiently
The pH of stomach will fall abruptly
Steapsin be more effective
Proteins will not be adequately hydrolysed by pepsin into proteoses and peptones
What are the tiny finger-like projections called that are inside the small intestine? These tiny finger-like projections absorb the nutrients form the food and send the vitamins, minerals, proteins, carbohydrates and fats into our bloodstream:
Esophagus
Arteries
Villi
Flagella
How is the digestion of fats different from that of proteins and carbohydrates?
Fat digestion occurs in the small intestine, and the digestion of proteins and carbohydrates occurs in the stomach
Fats are absorbed into the cells as fatty acids and monoglycerides but are then modified for absorption into the blood; amino acids and glucose are not modified further
Fats enter the hepatic portal circulation, but digested proteins and carbohydrates enter the lymphatic system
Digested fats are absorbed in the large intestine, and digested proteins and carbohydrates are absorbed in the small intestine
The initial step in the digestion of milk in infants is carried out by?
Pepsin
Assertion : Hepatopancreas of prawn is equivalent to the liver and pancreas of higher animals.
Reason : Hepatopancreas stores the absorbed nutrients from stomach and midgut.
Assertion : Rumen of alimentary canal of ruminant animals harbour numerous bacteria and protozoa.
Reason : Bacteria and protozoa help in the secretion of gastric juice in the rumen.
Assertion : Many tube like glands are present in the wall of small intestine.
Reason : These glands secrete enzymes DNAse and RNAse into the intestinal juice.
Assertion : Lipases of bile help in the emulsification of fats.
Reason : Lipases can break large fat droplets into smaller ones.
Assertion : Presence of HCl in stomach is necessary for the process of digestion.
Reason : HCl kills and inhibits the growth of bacteria in the stomach.
Assertion : Chewing is one of the important process of digestion in animals.
Reason : It helps in enzyme action.
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