How do the bubble-shaped sacs of the alveoli assist in gas exchange?
A. They control the flow of blood.
B. They maximize the exchange surface.
C. They sense when air is in the lungs.
D. They expand and contract to move air.
How do the bubble-shaped sacs of the alveoli assist in gas exchange?
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The correct answer is B. They maximize the exchange surface.
Alveoli are tiny air sacs in the lungs that are crucial for gas exchange. Their bubble-shaped structure increases the surface area available for oxygen and carbon dioxide to diffuse between the air in the lungs and the blood in capillaries. This maximized surface area allows for more efficient gas exchange, facilitating the transfer of oxygen into the bloodstream and the removal of carbon dioxide.