What is the exchange of gases (oxygen and carbon dioxide) primarily occurring in the lungs?

Study for the Pivot Point The Building Blocks of the Human Body 105E.01. Engage with multiple choice questions and flashcards, complete with hints and explanations. Get ready for your exam!

Multiple Choice

What is the exchange of gases (oxygen and carbon dioxide) primarily occurring in the lungs?

Explanation:
Gas exchange happens where air meets blood: in the tiny air sacs called alveoli. The alveolar walls are very thin and sit next to a dense network of capillaries, creating a large surface area for diffusion. Oxygen moves from the air in the alveoli into the blood because its partial pressure is higher there, while carbon dioxide diffuses from the blood into the alveolar air to be exhaled. The trachea and bronchi mainly serve to conduct air to the lungs, not to exchange gases, and the pleura are protective membranes around the lungs. So, the actual gas exchange occurs in the alveoli.

Gas exchange happens where air meets blood: in the tiny air sacs called alveoli. The alveolar walls are very thin and sit next to a dense network of capillaries, creating a large surface area for diffusion. Oxygen moves from the air in the alveoli into the blood because its partial pressure is higher there, while carbon dioxide diffuses from the blood into the alveolar air to be exhaled. The trachea and bronchi mainly serve to conduct air to the lungs, not to exchange gases, and the pleura are protective membranes around the lungs. So, the actual gas exchange occurs in the alveoli.

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