NEETZoologyBreathing and Exchange of Gases
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Neural signals from the pneumotaxic centre can alter the respiratory rate. Reason (R): The pneumotaxic centre can reduce the duration of inspiration by moderating the functions of the respiratory rhythm centre. In the light of the above statements, choose the correct answer from the options given b
Options
- ABoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- BBoth (A) and (R) are correct and (R) is the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
B. Both (A) and (R) are correct and (R) is the correct explanation of (A)
Step-by-step solution
According to NCERT, the pneumotaxic centre is located in the pons region of the brain and moderates the functions of the respiratory rhythm centre in the medulla. Neural signals from the pneumotaxic centre reduce the duration of inspiration. By shortening the inspiratory phase, the overall respiratory rate is altered (increased). Therefore, the assertion is a true statement, and the reason is also true and provides the correct physiological mechanism explaining how the pneumotaxic centre alters the respiratory rate