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Which of the following is correct? A) The partial pressure of oxygen in systemic venous blood is...

Question:

Which of the following is correct?

A) The partial pressure of oxygen in systemic venous blood is normally 40 mmHg.

B) The partial pressure of carbon dioxide in systemic venous blood is normally 40 mmHg.

C) The partial pressure of oxygen is normally lower in the alveoli than in systemic arterial blood.

D) The partial pressure of carbon dioxide is normally higher in the alveoli than in systemic arterial blood.

E) The partial pressures of carbon dioxide in the alveoli and pulmonary arterial blood are the same.

Arteries:

An essential blood vessel that plays a major role in supplying blood is known as the arteries. Four layers of arteries, such as tunica externa, tunica media, tunica interna and basal membrane. Arteries carry oxygen-rich blood.

Answer and Explanation: 1

The partial pressure of carbon dioxide is always higher in pulmonary arteries because the partial pressure of oxygen is low in the pulmonary capillaries. Oxygen diffuses out of the membrane, so the partial pressure of carbon dioxide is normally higher in alveoli.

Therefore the correct option is D)

According to Bohr, effect gases moves from the low-pressure area to the high-pressure area.

Please note that:

  • Option A) is incorrect because the partial pressure of oxygen in venous blood is about 70 to 80 mmHg.
  • Option B) is incorrect because the partial pressure of carbon dioxide in venous blood is about 104 mmHg.
  • Option C) is incorrect because the partial pressure of oxygen is high in system arterial blood.
  • Option E) is incorrect because pulmonary arterial blood pressure differs from alveoli.

Learn more about this topic:

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Carbon Dioxide Transport in the Blood

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Chapter 13 / Lesson 4
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Carbon dioxide is transported in the blood in two different forms, bicarbonate and carbaminohemoglobin. In this lesson, dive into carbon dioxide transportation in the blood, in the lungs, and in metabolizing tissues.


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