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More oxygen is also going to the muscles. This means the heart beats fewer times per minute than it would in a nonathlete. However, an athlete's heart rate may go up to 180 bpm to 200 bpm during exercise. Resting heart rates vary for everyone, including athletes.
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iron
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the answer is D. all of the above
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eye colour
Characterized by an inadequate number of circulating red blood cells due to the premature destruction of red blood cells by the spleen. ... A group of bone marrow disorders that are characterized by the insufficient production of one or more types of blood cells due to dysfunction of the bone marrow.