The structure through which gases are exchanged between the atmosphere and the blood is the:

Question 20 options:

diaphragm

alveolus

thymus

esophagus

trachea

Gas exchange is the delivery of oxygen from the lungs to the bloodstream, and the elimination of carbon dioxide from the bloodstream to the lungs. It occurs in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.

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