Question

3. Expiration of air from the lungs is a mostly passive process not requiring muscle action.

True or False?


4. Oxygen is transported around the cardiovascular system by dissolving within the blood.

True or False?

Answer 1

False and true (i'm not sure fully)

Explain:

1. (False) Expiration is usually a passive mechanism that occurs when the diaphragm muscle relaxes (that contracted during inspiration). The elastic recoil of the lungs is the primary cause for passive expiration.
2. (True)Despite the fact that oxygen dissolves in the blood, only a small amount is transferred this way.

Inside the air sacs, oxygen flows through paper-thin walls to tiny blood vessels known as capillaries, where it is absorbed into the blood. The oxygen is then transported throughout your body by a protein called haemoglobin, which is found in red blood cells.

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