Answer:
Option 3
Explanation:
The two structures which make up the site where gas exchange takes place in the body are alveoli and capillaries.
Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. Thus option C is correct.
Breathing is a process where the exchange of two gases occurs by intake of oxygen inside body called inspiration and release of carbon dioxide from body called as expiration.
It is a sequential event which starts with intake of atmospheric air through alveoli of the lungs, diffusion of gases across the alveolar membrane, transport by blood vessels,
Diffusion between blood and tissues, use of oxygen for catabolic reactions and release of carbon dioxide.
The exchange of gases which is a passive diffusion process occur between alveoli of lungs and the blood capillaries surrounding them
From alveoli oxygen is to the blood, and carbon dioxide is moved from the blood capillaries into the alveoli.
Thus option C is correct.
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