Quiz: Why and How do We Breathe?

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a. The person sucks in air, making the lungs expand (become larger), which pushes the diaphragm down. b. The diaphragm moves down, making the lungs expand (become larger). This makes air automatically flow in. c. The diaphragm moves up, making the lungs expand (become larger). This makes air automatically flow in. d. Air flows in, making the lungs shrink (become smaller). This pulls the diaphragm up.

Correct.

Incorrect.

a. Because it is a habit. b. To provide the cells in their body with oxygen. c. To be able to sing. d. To make blood flow through the body.

Correct.

Incorrect.

a. Some animals breathe though their skin b. Humans breathe out carbon dioxide. c. Some aquatic animals use lung breathing. d. Insects do not breathe.

Correct.

Incorrect.

Image Credit: Sabine De Brabandere, Science Buddies / Science Buddies

a. Label parts A-E

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