Verified answer

QUESTION:

Which of the following is true about the process of exhalation?

ANSWER:

• Air pressure in the cavity increases

Why?

• During exhalation, the diaphragm relaxes. It increases the pressure inside the lungs and allows air to go out of the lungs.

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QUESTION:

Which of the following best explains the diffusion of gases between the alveoli and the capillaries?

ANSWER:

• Gases move from a region of a higher concentration to a region of lower concentration

Why?

• As the gases diffuse between the alveoli and the capillaries, oxygen, and carbon dioxide always move from a region of higher concentration to a region of lower concentration.

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