The flow rate of blood through the pulmonary capillaries is slow enough and the

Question

The flow rate of blood through the pulmonary capillaries is slow enough and the exchange of gases fast enough, under resting conditions, that partial pressures of oxygen and carbon dioxide in pulmonary capillaries is nearly equal to those of alveolar air. When more strenuous exercise necessitates larger exchanges of gases

A.           diffusion rates of gases are increased by increased blood flow

B.           pulmonary capillary beds, which normally are closed during quiet breathing, are opened up by the increase in blood pressure associated with increased activity, and in turn increases the gas transport surface area of the lungs

C.           greater partial pressure of oxygen is created in the alveoli

D.           pulmonary capillary beds, which normally are open during quiet breathing, are closed with increase in blood pressure, resulting in a more rapid exchange of gases between the alveoli and capillaries

Explanation / Answer

B. pulmonary capillary beds which are normally closed during quite breathing, are opened up by the increase in blood pressure associated with increased activity, and inturn increases the gas transport area of the lung.

Explanation :

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