ANATOMY
LIMB VASCULATURE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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CO2 moves down the pressure gradient from capillary to alveoli
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O2 moves down the pressure gradient from capillaries to alveoli
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O2 moves down pressure gradient from alveoli to capillaries
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CO2 moves down the pressure gradient from alveoli to capillaries
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Once moved into the capillaries, O2 moves into pulmonary/systemic circulation
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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: -Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.
Detailed explanation-3: -The partial pressure of oxygen is high in the alveoli and low in the blood of the pulmonary capillaries. As a result, oxygen diffuses across the respiratory membrane from the alveoli into the blood. In contrast, the partial pressure of carbon dioxide is high in the pulmonary capillaries and low in the alveoli.
Detailed explanation-4: -The exchange of gases between the blood and tissue cells is internal respiration.