MCQ Questions for Class 11 Medical Biology Breathing And Exchange Of Gases Quiz 11

Which of the labelled blood vessels A, B, C or D carries oxygenated blood?

0%
A and B
0%
B and C
0%
A and D
0%
B and D

Mark the correct pair of muscles involved in the normal breathing in humans.

0%
External and internal intercostal muscles
0%
Diaphragm and abdominal muscles
0%
Diaphragm and external intercostal muscles
0%
Diaphragm and intercostal muscles

It is known that exposure to carbon monoxide is harmful to animals because

0%
it reduces $CO_{2}$ transport
0%
it reduces $O_{2}$ transport
0%
it increases $CO_{2}$ transport
0%
it increases $O_{2}$ transport.

The oxygen - haemoglobin dissociation curve will show a right shift in case of

0%
High $pCO_{2}$
0%
High $pO_{2}$
0%
Low $pCO_{2}$
0%
Less $H^+$ concentration

Explanation

An increase in

$[pCO_2]$ ,

$[H^+]$ , and temperature, can lead to the right shift of the oxygen-haemoglobin dissociation curve. The increase in

$[pCO_2]$ ,

$[H^+]$ causes a decrement in the pH which leads to the change in oxygen-haemoglobin binding.

So, the correct answer is (A)

What is the value of W, X, Y and Z normally? (in mmHg)

0%
(W) 95
(X) 40
(Y) 45
(Z) 40
0%
(W) 95
(X) 40
(Y) 40
(Z)45
0%
(W) 40
(X) 45
(Y) 95
(Z) 40
0%
(W) 95
(X) 45
(Y) 40
(Z)40

Explanation

In the tissues, exchange of gases occurs between the blood and the tissue cells through tissue fluids that surround the tissue cells. Blood that reaches the tissues has more partial pressure of

$O_{2}$ (P

$O_{2}$ = 95 mm Hg), than that already in the tissues (P

$O_{2}$ = 40 mm Hg).'Similarly partial pressure of

$CO_{2}$ is more in tissues (- 45 mm Hg) than in the blood {= 40 mm Hg). Due to these differences in partial pressure of gases,

$O_{2}$ from blood diffuses in the tissues and

$CO_{2}$ from tissues diffuses into the blood. This exchange of gases occurs simultaneously.

So the correct option is A.

Mark the incorrect statement in context to

$O_{2}$ binding to Hb.

0%
Higher pH
0%
Lower temperature
0%
Lower P $CO_{2}$
0%
Higher P $O_{2}$
0%
None of these

Explanation

None of the options is correct): Oxygen dissociation curve is highly useful in studying the effect of factors like p

$CO_{2}$ , H+ concentration, etc., on binding of

$O_{2}$ with haemoglobin, In the alveoli, where there is high p

$O_{2}$ , low p

$CO_{2}$ , high pH and lower temperature, the factors are'all favourable for the formation of oxyhaemoglobin.

Where does exchange of gases (

$O_2$ and

$CO_2$ ) take place in our lungs?

0%
Pleura
0%
Bronchi
0%
Alveoli
0%
Trachea

State the respective lowest and highest value of respiratory volumes.

0%
TV, VC
0%
ERV, IC
0%
TV, TLC
0%
RV, VC

In which part of the body blood gets oxygenated?

0%
Ventricle
0%
Lung
0%
Atrium
0%
Heart

Which of the following gas when passed through dilute blood will impart a cherry red colour to the solution?

0%
$CO_2$
0%
$COCl_2$
0%
$NH_3$
0%
$CO$

In which of the following places does the formation of oxyhemoglobin occur?

0%
Tissues
0%
Alveolar surface
0%
Blood
0%
Plasma

Which of the following symptom is associated with disease emphysema?

0%
Widening of alveoli
0%
Widening of bronchi
0%
Constriction of alveoli
0%
Constriction of bronchi

Combination of haemoglobin with

$O_2$ in lungs can be promoted by

0%
Increasing $CO_2$ concentration in blood
0%
Increasing $O_2$ concentration in blood
0%
Decreasing $O_2$ concentration in blood
0%
Introducing $CO$ in blood

Explanation

As blood passes through the lungs, It picks up oxygen due to the increased oxygen pressure in capillaries. It releases oxygen in tissues of lower oxygen concentration. An increased oxygen concentration in the blood promotes the oxygen-hemoglobin combination in the lungs. This increased affinity is caused by a conformational change in hemoglobin molecules. Each hemoglobin can bind four oxygen molecules.

So the correct answer is 'Increasing

$O_2$ concentration in blood'.

Lungs made up of which structures

0%
Branching network of Bronchi
0%
Bronchioles
0%
Alveoli
0%
All of the above

If a person exhales out forcefully by applying all his efforts, what will be the pulmonary volume inhaled by him immediately under the normal condition without applying any extra effort?

0%
TV + IRV
0%
Only TV
0%
TV+ERV
0%
TV + IRV + ERV

Which of the following can be considered as odd one?

0%
Larynx
0%
Glucagon
0%
Testosterone
0%
Prolactin

Carbon dioxide generated in the tissues is carried in venous blood primarily as

0%
Dissolved gas in plasma
0%
Carbamino haemoglobin
0%
Sodium bicarbonate
0%
Potassium bicarbonate

Oxyhaemoglobin dissociates into oxygen and deoxyhaemoglobin at

0%
low $O_2$ pressure in tissue
0%
high $O_2$ pressure in tissue
0%
equal $O_2$ pressure inside and outside tissue
0%
all times irrespective of $O_2$ pressure

Explanation

Factors that dissociate oxygen from haemoglobin include:-

The partial pressure of carbon dioxide is increased.
Increase in hydrogen ion level (pH).
Temperature is high
The partial pressure of oxygen is low which is near tissue.

So the correct option is 'low

$O_2$ pressure in tissue'

The volume of air remaining in the lungs even after a forceful expiration is

0%
Tidal volume
0%
Residual volume
0%
Inspiratory reserve volume
0%
Expiratory reserve volume

Which of the following factors affect the oxygen dissociation curve?

0%
Partial pressure of carbon dioxide
0%
$pH$ ( $H^+$ ion concentration)
0%
Temperature
0%
Partial pressure of oxygen
0%
All of the above

Oxygen dissociation curve in mammals is

0%
J-shaped
0%
Sigmoid shaped
0%
T-shaped
0%
L-shaped

The lungs are protected by two membranes called ________

0%
Pleural membrane
0%
Meninges
0%
Mucous membrane
0%
None of the above

In males, ______ play a role in the movement of respiratory system.

0%
Vertebrae
0%
Sternum
0%
Diaphragm
0%
Liver

At higher altitudes, the air becomes rarer and amount of oxygen per liter of air decreases.
Increase in all of the following would compensate this decrease for performing normal biological functions of our body, except

0%
The concentration of haemoglobin
0%
The number of red blood cells
0%
The temperature of the body
0%
The rate of breathing

Carotid artery supplies

0%
Oxygenated blood to lungs
0%
Oxygenated blood to intestine
0%
Oxygenated blood to brain
0%
None of these

Read the following statements (A to D)
(A) Rib is a flat bone connected vertebral column and dorsally to the sternum.
(B) First seven pairs of ribs are called true ribs.
(C) 8

$^{th}$ ,9

$^{th}$ and 10

$^{th}$ pairs of the ribs are called vertebro sternal ribs.
(D) 10

$^{th}$ and 11

$^{th}$ pairs of ribs are not connected dorsally and are therefore called floating ribs.
How many statements are correct?

0%
One
0%
Two
0%
Three
0%
None

During inspiration, the diaphragm

0%
Expands
0%
Shows no change
0%
Contracts and flattens
0%
Relaxed to become dome shaped

The gas which we breath out precipitates ______ into milky white.

0%
Sodium Chloride solution
0%
Calcium Carbonate solution
0%
Potassium Permanganate solution
0%
Potassium Bicarbonate solution

Explanation

The gas which we exhale or breath out is carbon-dioxide.

When this gas passes through calcium carbonate solution there occurs precipitation reaction between the solution, as a result, the color of the solution turns to milky white.

When CO

$_2$ is passed through lime water which is a diluted solution of Ca(OH)_2, it turns milky due to the formation of calcium carbonate

$CaCO_3$ .

So the option B is correct.

How many statements are wrong about asthma?

(i) The respiratory surface is decreased.
(ii) The only cause of it is cigarette smoking.
(iii) Due to inflammation of bronchi and bronchioles.
(iv) Alveolar walls are damaged altogether.
(v) Difficulty in breathing causes wheezing.

0%
One
0%
Two
0%
Three
0%
Five

Haemoglobin present in human blood binds to oxygen in which oxidation state?

0%
$Fe^{2+}$
0%
$Fe^{3+}$
0%
$Fe^{4+}$
0%
$Fe^+$

Haemoglobin shows maximum affinity with

0%
Carbon monoxide
0%
Carbon dioxide
0%
Oxygen
0%
Ammonia

Respiration involves following steps:
A. Diffusion of gases

${ O }_{ 2 }$ and

${ CO }_{ 2 }$ across alveolar membrane.
B. Transport of gases by blood.
C. Utilization of

${ O }_{ 2 }$ by cell for catabolic reaction and resultant release of

${ O }_{ 2 }$ .
D. Pulmonary ventilation by which atmospheric air is drawn in and

${ CO }_{ 2 }$ rich air is released out.
E. Diffusion of

${ O }_{ 2 }$ and

${ CO }_{ 2 }$ between blood and tissue.

0%
$A\rightarrow B \rightarrow C\rightarrow D\rightarrow E$
0%
$E\rightarrow D \rightarrow C\rightarrow B\rightarrow A$
0%
$D\rightarrow A \rightarrow B\rightarrow E\rightarrow C$
0%
$C\rightarrow B \rightarrow E\rightarrow A\rightarrow D$

Read the given statements and choose correct answer :-
(i) Initial bronchioles are supported by incomplete cartilagenous rings.
(ii) In human lungs are solid and spongy.
(iii) Alveoli wall contains simple squamous epithelium and white fibrous connective tissue (iv) Lungs are covered by a single layered pleura

0%
Three statements are correct
0%
Three statements are incorrect
0%
Only two statements are correct
0%
None of them

Inspiration occurs when

0%
Pressure inside lungs is lower than atmospheric pressure
0%
Pressure inside lungs is higher than atmospheric pressure
0%
Pressure inside lungs is same as atmospheric pressure
0%
Pressure has no effect

In man expired air contains oxygen about

0%
4%
0%
10%
0%
16%
0%
20%

During one circuit of blood from lungs to the tissue and back through the circulatory system the percentage of hemoglobin given oxygen is-

0%
$50\%$
0%
$25\%$
0%
$75\%$
0%
$100\%$

Explanation

$\textbf{Correct Option A}$

$\textbf{Solution}$

$\bullet$ One complete circle of the blood from lungs to the tissue and then back to the lungs through the circulatory system, the percentage of hemoglobin given oxygen is 50%, which is also known as P 50.

$\bullet$ This happens because 50% of the hemoglobin group belonging to each hemoglobin has a molecule of oxygen bound to it.

$\bullet$ In lungs the amount of hemoglobin around 100 mmHg. Affinity of the fourth oxygen molecule the saturation remain high at around 60mmHg. But then it decreases gradually when the hemoglobin saturation falls down to 40 mmHg.

$\bullet$ It then again falls down to 25 mmHg where the saturation of the hemoglobin is 50%.

$\bullet$ So, the correct option is A.

Which of the following is true for

$CO_2$ concentration?

0%
More in alveolar air than in expired
0%
More in expired air than in alveolar air
0%
More in inspired air than in alveolar air
0%
More in inspired air than in expired air

Explanation

In the alveoli, the oxygen is continuously absorbed by the blood and CO

$_{2}$ is continuously added by the blood. So, the alveolar air has more CO

$_{2}$ concentration than the expired air.

Hence, the correct answer is 'More in alveolar air than in expired air'

The blood leaving the lungs has its haemoglobin oxygenated and unloads its oxygen to the tissues, because
(2) (3) (4)

0%
The tissues can absorb ${ O }_{ 2 }$ from oxyhaemoglobin
0%
${ O }_{ 2 }$ concentration in tissues is lower and ${ CO }_{ 2 }$ concentration higher than that of lungs
0%
${ O }_{ 2 }$ concentration in tissues is higher and ${ CO }_{ 2 }$ concentration lower than that of lungs
0%
Oxyhaemoglobin undergoes reduction

Select the correct match pair:-

0%
$PO_{ 2 }$ in atmospheric air -40mm Hg
0%
$PCO_{ 2 }$ in atmospheric air -40mm Hg
0%
$PO_{ 2 }$ in deoxygenated air -45mm Hg
0%
$PCO_{ 2 }$ in oxygenated air -40mm Hg

Read the following statements carefully and select the incorrect statement

0%
Carbon monoxide binds to Hb with higher affinity than oxygen and forms carboxyhemoglobin
0%
Nearly 23% of oxygen is transported as oxyhemoglobin in RBC's of blood.
0%
100 ml of deoxygenated blood delivers approximately 4 ml of $CO_2$ to the alveoli under normal physiological conditions.
0%
About 72% of $CO_2$ gets transported via blood plasma.

Explanation

Carbon monoxide is a poisonous gas which binds to hemoglobin with higher affinity than the oxygen. It has about 200 times more affinity for hemoglobin as compared to oxygen. When it binds to hemoglobin, it forms carboxyhemoglobin. About 97% of oxygen is transported as oxyhemoglobin in RBCs of the blood. The remaining 3% is transported through the plasma. Similarly, about 20-25% of C0

$_2$ is transported by RBCs, about 72% of it is transported as bicarbonate via blood plasma and about 7% is bound to plasma protein. Every 100 ml of oxygenated blood delivers approximately 5 ml of oxygen to tissues under normal physiological conditions. Similarly, every 100 ml of deoxygenated blood delivers approximately 4 ml of C0

$_2$ to the alveoli under normal physiological conditions.

Thus, the correct answer is 'Nearly 23% of oxygen is transported as oxyhemoglobin in RBC's of blood.'

Which of the following is correct for oxygen transport ?

0%
Nearly 20-25 percent of ${ CO }_{ 2 }$ is transported by RBCs
0%
3 percent of ${ O }_{ 2 }$ is carried in a dissolved state through the plasma
0%
Maximum ${ CO }_{ 2 }$ transport in the form of bicarbonate
0%
Both B and C

Which of the following factors are involve in left shifting of oxygen dissociation curve?

0%
High ${ PO }_{ 2 }$ and low pH
0%
High ${ PCO }_{ 2 }$ and high $H^+$ concentration
0%
Low ${ PO }_{ 2 }$ and low temperature
0%
High ${ PO }_{ 2 }$ and low temperature

The compound, which is soluble in water but does not impede the oxygen transportation, is

0%
NO
0%
$SO_2$
0%
CO
0%
$SO_3$

When under certain conditions,

${ P }_{ 50 }$ value in blood rises, the affinity of respiratory pigment of combining with

${ O }_{ 2 }$ will:

0%
Remain same
0%
Rise
0%
Fall
0%
First rise and then fall

Explanation

The

${ P }_{ 50 }$ is the oxygen partial pressure at which hemoglobin is 50% saturated. The normal

${ P }_{ 50 }$ is 26.7 mm Hg. Shifting the oxyhemoglobin dissociation curve to the right increases

${ P }_{ 50 }$ and lowers the hemoglobin’s affinity for oxygen.

So the correct answer is option 'C'.

What do the trachea and bronchi possess in their wall of the respiratory tract in man?

0%
C-shaped cartilagenous rings
0%
C-shaped bony rings
0%
V-shaped bony rings
0%
V-shaped cartilagenous rings

In the tissues high concentration of carbon dioxide

0%
Increase the affinity if haemoglobin to both oxygen and hydrogen
0%
Increase the affinity of haemoglobin to oxygen but decrease it affinity to hydrogen
0%
Decrease the affinity of Haemoglobin to oxygen but increase its affinity to hydrogen
0%
Decrease the affinity of haemoglobin to both hydrogen and oxygen

Which of the following is the correct path of oxygen in humans during inhalation?

0%
Nostrils $\rightarrow$ Nasal Cavity $\rightarrow$ Pharynx $\rightarrow$ Trachea $\rightarrow$ Bronchi $\rightarrow$ Bronchiole $\rightarrow$ Alveoli
0%
Nostrils $\rightarrow$ Nasal Cavity $\rightarrow$ Trachea $\rightarrow$ Pharynx $\rightarrow$ Bronchi $\rightarrow$ Bronchiole $\rightarrow$ Alveoli
0%
Nostrils $\rightarrow$ Nasal Cavity $\rightarrow$ Pharynx $\rightarrow$ Trachea $\rightarrow$ Alveoli $\rightarrow$ Bronchi $\rightarrow$ Bronchiole
0%
Nostrils $\rightarrow$ Nasal Cavity $\rightarrow$ Pharynx $\rightarrow$ Bronchi $\rightarrow$ Trachea $\rightarrow$ Bronchioles $\rightarrow$ Alveoli

The mucus produced by the goblet cells
(I) Moistens the incoming air
(II) Traps the finest dust particles
(III) Filter out largest dust particles
(IV) Warm the incoming air

0%
I and II
0%
II and III
0%
Only IV
0%
All of these

Increase in body temperature makes oxygen haemoglobin curve to shift?

0%
Right
0%
Left
0%
Central
0%
None of these

Which of the following happens with the increase in body temperature due to enhanced metabolic activities in the human body?

0%
Oxyhaemoglobin dissociation curve will shift to right side at tissue level
0%
Affinity of haemoglobin for oxygen will increase at tissue level
0%
Sensitivity of chemoreceptors to $pO_2$ increases dramatically white it falls for $pCO_2$ & $H^+$
0%
Bohr's effect will not occur

CBSE Questions for Class 11 Medical Biology Breathing And Exchange Of Gases Quiz 11 - MCQExams.com

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Practice Class 11 Medical Biology Quiz Questions and Answers

CBSE Questions for Class 11 Medical Biology Breathing And Exchange Of Gases Quiz 11 - MCQExams.com

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Practice Class 11 Medical Biology Quiz Questions and Answers

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