Question

the ____ is where oxygen diffuses into the bloodstream for use by the body, and carbon dioxide passes from the blood for exhalation. a) trachea b) capillaries c) bronchi d) alveoli

Explanation:

The alveoli are tiny air - sacs in the lungs where gas exchange occurs. Oxygen diffuses from the alveoli into the bloodstream, and carbon dioxide diffuses from the blood into the alveoli for exhalation. The trachea is the windpipe, bronchi are the main airways into the lungs, and capillaries are small blood vessels, but the specific site of gas exchange is the alveoli.

Answer:

d) alveoli