gas exchange

What happens to the volume and pressure in the lungs when we inspire (inhale)?

• volume and pressure decreases

• volume and pressure increases

• volume decreases, pressure increases

• volume increases, pressure decreases

What happens to the volume and pressure in the lungs when we expire (exhale)?

• volume and pressure decreases

• volume and pressure increases

• volume decreases, pressure increases

• volume increases, pressure decreases

Every cell in our body needs a supply of oxygen. The cells use oxygen for ___?

• respiration

• breathing

• digestion

Air is around 20% oxygen.

• true

• false

In the lungs, oxygen diffuses into the blood and carbon dioxide diffuses out of the blood. This is called what?

• breathing

• gas exchange

• respiration

What do you call this part of the human lung (seen through a microscope)?

• air sacs/alveoli

• lung cells

• capillaries

• bronchioles

Which is true about diffusion?

• occurs from a higher concentration to a lower concentration

• occurs from a lower concentration to a higher concentration

Blood which ENTERS the capillaries of the lungs have ______ oxygen.

• more

• less

In the diagram, oxygen diffuses from the air sac into the capillaries.

• true

• false

When you breathe, your lungs take in ___ and remove ___.

• air/oxygen

• oxygen/carbon dioxide

• carbon dioxide/waste

• waste/air