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Question

The exchange of gases between blood capillaries and alveoli in the lungs is through

A
simple diffusion
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B
active transport
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C
osmosis
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D
facilitated diffusion
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Solution

The correct option is A simple diffusion
Passive or simple diffusion is the movement of solutes (gas or ions) from an area of high concentration to an area of low concentration. Gases diffuse across the systemic capillary membrane and the cell membranes of the target tissue. Carbon dioxide diffuses from systemic tissues to lungs, and oxygen diffuses from lungs to systemic tissues


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