Air entering the lungs has

Question

Quizplus · Accepted Answer

Air entering the lungs has a higher concentration of oxygen and a lower concentration of carbon dioxide than in an alveolus. When we inhale, we breathe in air that is rich in oxygen (about 21% oxygen) and low in carbon dioxide (about 0.04% carbon dioxide). In contrast, the alveoli are where gas exchange takes place, and the oxygen is diffused from the alveoli into the bloodstream while carbon dioxide is diffused from the blood into the alveoli, resulting in a higher concentration of oxygen and lower concentration of carbon dioxide in the alveoli than in the inhaled air. Therefore, option C is the correct answer.

Air Entering the Lungs Has