Question

question 25 of 30
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in the systemic capillaries, oxygen gas diffuses____the tissues and carbon dioxide gas diffuses____the tissues.
into; out of
out of; into
out of; out of
into; into

Explanation:

In systemic capillaries, oxygen moves from an area of higher concentration (in the blood) to an area of lower concentration (in the tissues) by diffusion. Carbon dioxide, which is produced in the tissues (higher concentration in tissues) moves to an area of lower concentration (in the blood) for transport to the lungs. So oxygen diffuses into the tissues and carbon dioxide diffuses out of the tissues.

Answer:

A. into; out of