Life span of Red Blood Cells_____?
Correct answer: B. 120 Days
- A. 150 Days
- B. 120 Days
- C. 80 Days
- D. 100 Days
Explanation
Red blood cells circulate for about 120 days before ageing changes their membranes and they are removed mainly by the spleen and liver. Students may choose 150 days because RBCs survive for several months, but the standard average lifespan is 120 days.
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The human heart is a four chambered muscular pump that maintains double circulation through the pulmonary and systemic circuits. Questions cover atria, ventricles, valves, major blood vessels, the cardiac cycle, pressure changes, the conduction system and ECG, while distinguishing arteries and veins from the chambers that receive or eject blood.
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