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Transportation of Food and Minerals in Animals and Plants — BIOLOGY STD 8 — Question

ICSE BoardEnglish MediumSTD 8BIOLOGYTransportation of Food and Minerals in Animals and Plants3 Marks
Question
Why does the rate of heartbeat increases after running ?
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Answer

As we exercise our skeletal muscles use up sugar and oxygen which are supplied to the muscles via the blood. In order to maintain adequate levels of sugar and oxygen the heart tries to speed up the rate at which the blood is circulating by pumping faster. Heart rate will increase with exercise.
As we exercise our body uses more energy because we are working harder and so during respiration we uses lots of oxygen and produces toxic $CO_2$ Our heart has to pump harder to get more oxygen to these cells and to remove $CO_2$​​​​​​​ by our blood, which goes up to our lungs to get oxygerated. Hence we breathe faster to get our blood oxygenated and get rid of carbon dioxide $(CO_2)$ So, we conclude that heart rate will increase with exercise.

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