Question

in which part of the human respiratory system does actual oxygen exchange take place?
○ alveoli
○ diaphragm
○ bronchi
○ trachea

Explanation:

The alveoli are tiny air - sacs in the lungs. They have thin walls and a large surface area. Oxygen from the inhaled air diffuses across the alveolar walls into the blood, and carbon dioxide diffuses from the blood into the alveoli to be exhaled. The trachea is just a passage for air. The bronchi are also air - conducting passages. The diaphragm is a muscle that aids in the process of breathing (inhalation and exhalation) but is not the site of gas exchange.

Answer:

alveoli