Question

bronchi.

pharynx.

larynx.

alveoli.

Oxygen enters the blood in the

(1 point)

C

C

C

Answer 1

Alveoli.

They are the tiny air sacs in the lungs where gas exchange occurs — O2 diffuses across the thin alveolar and capillary walls into the blood. The pharynx, larynx and bronchi are airways, not the primary sites of gas exchange.