Q:

Given that de-oxygenated blood entering the alveolar capillaries has an oxygen partial pressure of 42 mmHg and a carbon dioxide partial pressure of 47 mmHg, while the partial pressures of O 2 and CO 2 in the alveolar air are 103 mmHg?

waelhammad
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2022-10-19
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Given that de-oxygenated blood entering the alveolar capillaries has an oxygen partial pressure of 42 mmHg and a carbon dioxide partial pressure of 47 mmHg, while the partial pressures of O 2 and CO 2 in the alveolar air are 103 mmHg and 40 mmHg respectively; which of the following gas movements will occur? 

  1. Both CO 2 and O 2 move from alveolar air to the capillaries.
  2. CO 2 moves from alveolar air to capillaries and O 2 moves from capillaries to the alveolar air.
  3. Both CO 2 and O 2 move from capillaries to alveolar air
  4. CO 2 moves from capillaries to alveolar air and O 2 moves from alveolar air to the capillaries.
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waelhammad
2022-10-19
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D: Dissolved substances will diffuse from where they are in high concentration to where they are at lower concentration. So O 2 moves from alveolar air (where it is at 103 mmHg) to the capillaries (at 42 mmHg), while CO 2 moves from capillaries (47 mmHg) to alveolar air (40 mmHg).

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