ANIMAL PHYSIOLOGY
GAS EXCHANGE IN HUMANS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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oxygen and carbon dioxide entering the capillaries
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oxygen entering the capillaries and carbon dioxide entering the alveoli
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carbon dioxide entering the capillaries and oxygen entering the alveoli
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oxygen and carbon dioxide leaving the alveoli
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Detailed explanation-1: -During gas exchange oxygen moves from the lungs to the bloodstream. At the same time carbon dioxide passes from the blood to the lungs. This happens in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.
Detailed explanation-2: -Diffusion is the spontaneous movement of gases, without the use of any energy or effort by the body, between the alveoli and the capillaries in the lungs.
Detailed explanation-3: -Oxygen breathed in from the air passes through the alveoli and into the blood and travels to the tissues throughout the body. Carbon dioxide travels in the blood from the body’s tissues and passes through the alveoli to be breathed out.
Detailed explanation-4: -Gas exchange in the alveoli occurs primarily by diffusion. Traveling from the alveoli to capillary blood, gases must pass through alveolar surfactant, alveolar epithelium, basement membrane, and capillary endothelium.
Detailed explanation-5: -1. The exchange of gases between blood capillaries and the cell is called internal respiration. 2. The exchange of gases between the alveoli and the blood capillaries is called external respiration.