How Much Do You Know About Your Organs?

What causes your lungs to expand?

32%

Correct Incorrect Tiny alveoli sacs in the lungs gather air during inhalation. This oxygen then binds to hemoglobin and is transported throughout the body via the bloodstream, circulated by the heart.

What causes your lungs to expand?

Air filling the trachea
Air filling the alveolus sacks
The heart fills it with blood.
The stomach fills it with nutrients.

32%