The expected number of RBCs in a single drop, or microliter, of blood is _________ million in Men.
Correct answer: D. 4.5 to 6.2 million
- A. 4.0 to 5.2 million
- B. 3.4 to 6.8 million
- C. 3.2 to 7.2 million
- D. 4.5 to 6.2 million
Explanation
Adult men commonly have about 4.5–6.2 million red blood cells per microlitre of blood. The range is higher than the usual female range because androgens stimulate red-cell production.
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The human body is studied through its organ systems, including digestion, respiration, circulation, excretion, nervous coordination, reproduction and immunity. Coverage also includes nutrients and deficiency diseases, hormones, blood groups, common infections, vaccines, sanitation and basic first aid, while distinguishing communicable diseases from inherited and lifestyle disorders.
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