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?

False and true (i'm not sure fully)

Explain:    

(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.(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.

hope this helps!!!

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.

The answer is epidermis