HUMAN PHYSIOLOGY
BODY FLUIDS AND CIRCULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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120 hours
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120 month
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120 days
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102 days
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Detailed explanation-1: -Human red blood cells (RBC), after differentiating from erythroblasts in the bone marrow, are released into the blood and survive in the circulation for approximately 115 days.
Detailed explanation-2: -Human red blood cells are formed mainly in the bone marrow and are believed to have an average lifespan of approximately 120 days after which they are replaced.
Detailed explanation-3: -Human red blood cells (RBCs) are normally phagocytized by macrophages of splenic and hepatic sinusoids at 120 days of age. The destruction of RBCs is ultimately controlled by antagonist effects of phosphatidylserine (PS) and CD47 on the phagocytic activity of macrophages.
Detailed explanation-4: -So, the correct answer is ‘120 days’