The average life span of an RBC is:
Correct answer: A. 120 days
- A. 120 days
- B. 30 days
- C. 60 days
- D. 90 days
Explanation
Normal human red blood cells have an average life span of 120 days in the circulation after which they are engulfed by macrophages.
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About Circulation
The circulatory system covers the chambers, valves and conducting pathway of the human heart, along with the cardiac cycle and control of heartbeat. It compares arteries, veins and capillaries by structure and function, and explains how the lymphatic system returns tissue fluid, transports absorbed fats and supports immunity.
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