Human Body Test 2

Match it! Select the correct answer from the pull down...Good luck!

Generally speaking, what control breathing?

The process by which oxygen and carbon dioxide are exchanged between cells, the blood, and air in the lungs is one type of

In the walls of the heart, there are two thin layers that form a sandwich around a thick layer of muscle called the

Air is forced into the lungs by the contraction of the

Air is filtered, warmed, and moistened in the

What structure serves as a passageway for both air and food?

Which of the following are the smallest of the blood vessels?

The function of valves in the human circulatory system is to