BI-1144
Components of blood
Biology · Secondary 3 · Medium · Components of blood
At high altitude, the air contains less oxygen. After several weeks, an athlete’s blood contains more red blood cells per mm³. How does this change help the athlete?
- It increases the rate of sweating.
- It allows more oxygen to be carried to the muscles.
- It reduces the heart rate permanently.
- It decreases the volume of blood pumped each beat.
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