Question

If the respiratory rate of 'N is 35 breaths/min and tidal volume 185 cc/breath and of 'V is 25 breaths/min and tidal volume 29 cc/breath then
A. Pulmonary ventilation of 'A' and 'B' is the same.
B. Alveolar ventilation of' and 'B' is the same.
C. Pulmonary ventilation of 'A' is greater than 'B'.
D. Alveolar ventilation of 'A' is greater than 'B'.

Answer 1

Hint: Breathing is also known as pulmonary ventilation which is the process of inhalation and exhalation of air in and outside the lungs.
It is dependent upon the respiratory rate and tidal volume of an organism.

Complete answer: The process of breathing is also referred to as pulmonary ventilation and it is the process in which air flows into the lungs during the process of inhalation and exhaled out during the process of exhalation.

Pulmonary Ventilation = (Tidal volume $-$ Dead Space) $\times$ Respiratory Rate.
That means it is directly proportional to the difference of Tidal Volume - Dead space and the respiratory rate. In question, A has more respiratory rate and also the tidal volume.
So it had more pulmonary ventilation.

Hence, the correct option is (C), Pulmonary Ventilation of A is greater than B.

Note: Measure of pulmonary ventilation is the difference between tidal volume and dead space volume multiplied by the respiratory rate of an organism. This indicates that more the tidal volume or respiratory rate more will be the pulmonary ventilation of an organism.