Which of the following is NOT a major class of plasma proteins?

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Multiple Choice

Which of the following is NOT a major class of plasma proteins?

The key idea is that plasma proteins fall into three major groups: albumins, globulins, and fibrinogens. Hemoglobin, on the other hand, is the oxygen-carrying protein located inside red blood cells, not a dissolved plasma protein. In normal physiology, only the three protein classes circulate freely in plasma and perform their specific roles—albumins help maintain osmotic pressure and transport substances, globulins include antibodies and transport proteins, and fibrinogen is the clotting factor that forms fibrin during coagulation. If hemoglobin is found in plasma, it signals red blood cell breakdown rather than being a regular plasma protein class.

The key idea is that plasma proteins fall into three major groups: albumins, globulins, and fibrinogens. Hemoglobin, on the other hand, is the oxygen-carrying protein located inside red blood cells, not a dissolved plasma protein. In normal physiology, only the three protein classes circulate freely in plasma and perform their specific roles—albumins help maintain osmotic pressure and transport substances, globulins include antibodies and transport proteins, and fibrinogen is the clotting factor that forms fibrin during coagulation. If hemoglobin is found in plasma, it signals red blood cell breakdown rather than being a regular plasma protein class.

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