Regulation of Respiration — NEET Biology MCQs with Solutions
Free NEET Biology Regulation of Respiration MCQs with step-by-step solutions (16 questions). Part of Breathing and Exchange of Gases. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Regulation of Respiration · easy
Respiratory process is regulated by certain specialized centres in the brain. One of the following listed centres can reduce the inspiratory duration upon stimulation:
A. Chemosynthetic centre
B. Medullary inspiratory centre
C. Pneumotaxic centre ✓ Correct
D. Apneustic centre
Solution: The pneumotaxic centre in the pons can reduce the duration of inspiration and thereby alter the respiratory rate.
Q2 — Regulation of Respiration · easy
Pneumotaxic centre is present in:
A. Medulla oblongata
B. Pons ✓ Correct
C. Cerebrum
D. Cerebellum
Solution: The pneumotaxic centre lies in the pons region of the brain.
Q3 — Regulation of Respiration · easy
The breathing centre initiates ventilation in response to:
A. The rate of gas exchange in the alveoli
B. A decrease in air pressure
C. A decrease in O2
D. An increase in CO2 ✓ Correct
Solution: An increase in CO2 (and H+) in arterial blood stimulates the respiratory centre to initiate/increase ventilation.
Q4 — Regulation of Respiration · medium
All of the following factors play a role in the regulation of respiratory rhythm, EXCEPT:
A. H+ concentration
B. O2 ✓ Correct
C. CO2
D. None of the above is correct
Solution: Respiratory rhythm is chiefly regulated by CO2 and H+ levels; oxygen plays no significant role in this regulation.
Q5 — Regulation of Respiration · medium
Receptors associated with the aortic arch and carotid artery can recognise changes in ______ and ______ concentration and send necessary signals to ______ for remedial action.
A. CO2, H+, rhythm centre ✓ Correct
B. CO2, H+, apneustic centre
C. O2, H+, Pneumothorax
D. O2, CO2, Pneumothorax
Solution: Aortic and carotid receptors detect changes in CO2 and H+ and signal the respiratory rhythm centre to make corrective adjustments.
Q6 — Regulation of Respiration · medium
Respiratory centre of the brain is stimulated by:
A. CO2 content in venous blood
B. O2 content in arterial blood
C. CO2 content in arterial blood ✓ Correct
D. O2 content in venous blood
Solution: The respiratory centre is stimulated mainly by the CO2 (and H+) content of arterial blood.
Q7 — Regulation of Respiration · medium
Respiratory process is regulated by certain specialized centres in the brain. Which of the following listed centres can reduce the inspiratory duration upon stimulation?
A. Medullary inspiratory centre
B. Chemosensitive centre
C. Apneustic centre
D. Pneumotaxic centre ✓ Correct
Solution: The pneumotaxic centre in the pons sends signals that reduce the duration of inspiration and alter the breathing rate.
Q8 — Regulation of Respiration · hard
Assertion (A): The role of oxygen in regulating respiratory rhythm is quite insignificant. Reason (R): The respiratory rhythm centre is primarily sensitive to CO2 and hydrogen ion levels.
A. Both A and R are true but R is NOT the correct explanation of A.
B. A is true but R is false.
C. Both A and R are true and R is the correct explanation of A. ✓ Correct
D. A is false but R is true.
Solution: Because the rhythm centre responds mainly to CO2 and H+ levels, oxygen plays only a minor regulatory role, so R explains A.
Q9 — Regulation of Respiration · hard
Assertion (A): Pneumotaxic centre can alter the respiratory rate. Reason (R): Neural signals from this centre can increase the duration of inspiration.
A. Both A and R are true and R is the correct explanation of A.
B. A is false but R is true.
C. A is true but R is false. ✓ Correct
D. Both A and R are true but R is NOT the correct explanation of A.
Solution: The pneumotaxic centre can alter respiratory rate (A true), but its signals reduce the duration of inspiration, not increase it (R false).
Q10 — Regulation of Respiration · hard
Assertion (A): High H+ concentration in the blood increases the breathing rate. Reason (R): Chemosensitive areas and receptors in the aortic arch recognize changes in CO2 and H+ levels.
A. A is false but R is true.
B. A is true but R is false.
C. Both A and R are true but R is NOT the correct explanation of A.
D. Both A and R are true and R is the correct explanation of A. ✓ Correct
Solution: The chemosensitive areas and aortic receptors detecting rising CO2 and H+ trigger increased breathing, so R explains A.
Q11 — Regulation of Respiration · medium
Choose the correct statement about the Respiratory Rhythm Centre:
A. It is primarily responsible for the regulation of respiration. ✓ Correct
B. It is located in the pons region of the brain.
C. It is independent of the chemosensitive area.
D. It is highly sensitive to Oxygen levels in the blood.
Solution: The respiratory rhythm centre in the medulla is primarily responsible for regulation of respiration.
Q12 — Regulation of Respiration · hard
Which statement about the Pneumotaxic Centre is correct?
A. It is located in the medulla.
B. It can increase the duration of inspiration.
C. It is primarily sensitive to H+ ions.
D. It moderates the functions of the respiratory rhythm centre. ✓ Correct
Solution: The pneumotaxic centre in the pons moderates the functions of the respiratory rhythm centre and can reduce inspiration duration.
Q13 — Regulation of Respiration · hard
Regarding chemoreceptors in the aortic arch and carotid artery, which statement is correct?
A. They send signals to the pneumotaxic centre.
B. They are part of the respiratory rhythm centre.
C. They recognize changes in CO2 and H+ concentration. ✓ Correct
D. They recognize changes in O2 concentration.
Solution: The chemoreceptors in the aortic arch and carotid artery recognise changes in CO2 and H+ concentration and signal the respiratory centre.
Q14 — Regulation of Respiration · hard
Statement I: The respiratory rhythm centre is located in the pons region of the brain. Statement II: The pneumotaxic centre is located in the medulla region of the brain.
A. Both Statement I and Statement II are incorrect. ✓ Correct
B. Statement I is incorrect but Statement II is correct.
C. Statement I is correct but Statement II is incorrect.
D. Both Statement I and Statement II are correct.
Solution: The rhythm centre is in the medulla and the pneumotaxic centre is in the pons, so both statements are reversed.
Q15 — Regulation of Respiration · hard
Statement I: The pneumotaxic centre can moderate the functions of the respiratory rhythm centre. Statement II: Neural signals from the pneumotaxic centre can reduce the duration of inspiration.
A. Both Statement I and Statement II are incorrect.
B. Statement I is correct but Statement II is incorrect.
C. Both Statement I and Statement II are correct. ✓ Correct
D. Statement I is incorrect but Statement II is correct.
Solution: The pneumotaxic centre moderates the rhythm centre and can reduce inspiration duration.
Q16 — Regulation of Respiration · hard
Statement I: The role of oxygen in the regulation of respiratory rhythm is quite insignificant. Statement II: The chemosensitive area is highly sensitive to CO2 and hydrogen ions.
A. Statement I is correct but Statement II is incorrect.
B. Both Statement I and Statement II are correct. ✓ Correct
C. Statement I is incorrect but Statement II is correct.
D. Both Statement I and Statement II are incorrect.
Solution: O2's role in rhythm regulation is insignificant while the chemosensitive area responds to CO2 and H+.