Question

the air sacs that are covered with capillaries where gas exchange takes place is called what? lungs alveoli bronchi oxygen

Explanation:

• Lungs are the main organs of the respiratory system but not the specific air - sacs for gas exchange.
• Alveoli are small air - sacs covered with capillaries where oxygen and carbon dioxide are exchanged.
• Bronchi are the main passageways into the lungs, not the site of gas exchange.
• Oxygen is a gas, not a structure.

Answer:

B. alveoli