When a person travels to areas of higher altitudes, his or her blood oxygen level decreases. After the person has been exposed to lower oxygen for a period of several weeks, they produce more red blood cells than normal.
— Explain why this response occurs.
— Explain what will happen when the body returns to its normal altitude and oxygen level.
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When a person travels to areas of higher altitudes, his or her blood oxygen level decreases. After t...
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