Multiple choice

Which of the following statements referring to transport of the gases by the blood is correct?

  1. Exiting from the lungs, each litre of blood carries about 2 ml of oxygen.

  2. Haemoglobin is half saturated with oxygen when the PO2 is about 3.3 kPa and PCO2 is 5.3 kPa.

  3. As the PCO2 rises, the compatibility of hemoglobin for oxygen increases.

  4. Each litre of arterial blood contains about 5 mL of carbon dioxide.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The primary function of hemoglobin is to transport oxygen. When half of the sites are filled with oxygen, the blood is said to be 50% saturated. This happens when the PO2 is about 3.3 kPa and PCO2 is 5.3 kPa.

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