Gas exchange occurs by the process of . Gas exchange occurs in saclike structures called . diffuses from the alveolar sacs into the blood in the capillaries. diffuses from the blood in the capillaries into the alveolar sacs.

Explanation:

As blood passes through the lungs, it picks up oxygen and gives up carbon dioxide simply by diffusion down partial pressure gradients between blood and Alveoli,.

The blood having returned from body is relatively low in oxygen and high in carbon dioxide. On the other hand the alveolar air has higher oxygen concentration and lower carbon dioxide concentration.

Thus, when venous blood flows through pulmonary capillaries, oxygen moves from alveoli into the capillaries while carbon dioxide flows from capillaries into the alveoli.

Gas exchange occurs by the process of  diffusion

Gas exchange occurs in saclike structures called  alveoli

Oxygen  diffuses from the alveolar sacs into the blood in the capillaries.

Carbon dioxide  diffuses from the blood in the capillaries into the alveolar sacs.

Explanation:

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