Question

cardiovascular & respiratory health
each time you inhale, oxygen makes it way to millions of tiny, sponge like sacs called_____
○ capillaries
○ blood vessels
○ alveoli
○ cells

Explanation:

Alveoli are tiny, sponge - like sacs in the lungs where gas exchange occurs. Oxygen from inhaled air reaches the alveoli and diffuses into the bloodstream. Capillaries are tiny blood vessels, blood vessels are a general term for vessels carrying blood, and cells are the basic unit of life. But the specific tiny, sponge - like sacs for oxygen exchange are alveoli.

Answer:

C. alveoli