BI-1106
The heart
Biology · Secondary 3 · Hard · The heart
Two students measure their pulse rates before, during and after 1 minute of vigorous exercise. Which statement best explains why their pulse rates increase during exercise?
- To reduce the amount of oxygen delivered to muscles so they switch to anaerobic respiration.
- To pump more blood to muscles, supplying extra oxygen and glucose and removing more carbon dioxide.
- To keep blood pressure constant by decreasing the volume of blood leaving the heart.
- To cool the body by sending less blood to the skin and more to internal organs only.
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