In internal respiration, the partial pressures are: A)capillaries: low PO₂, high PCO_2; tissue fluid: low PO₂, high PCO₂ B)capillaries: high PO₂, low PCO₂; tissue fluid: low PO₂, high PCO₂ C)capillaries: low PO₂, high PCO_2; tissue fluid: high PO₂, low PCO₂ D)capillaries: high PO₂, low PCO_2; tissue fluid: high PO₂, low PCO₂

Question

Quizplus · Accepted Answer

In internal respiration, oxygen moves from areas of higher partial pressure to areas of lower partial pressure, and carbon dioxide moves in the opposite direction. Therefore, in the capillaries, the partial pressure of oxygen (PO2) is high, allowing oxygen to diffuse into the tissues where PO2 is low. Conversely, the partial pressure of carbon dioxide (PCO2) is low in the capillaries and high in the tissue fluid, facilitating its diffusion into the blood.

In Internal Respiration, the Partial Pressures Are