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Lelu [443]
3 years ago
11

Which factor affects the heart rate in mammals?

Biology
2 answers:
Nimfa-mama [501]3 years ago
5 0

Answer: Option C

Explanation: The factors that affect the heart rate of an human is need for oxygen. If there is a need of oxygen then the heart will pump blood very fastly to meet the demand of oxygen.

When there is a normal supply of oxygen in the body then the heart pumps the blood in a normal heart rate.

il63 [147K]3 years ago
4 0
The answer is C- The need for Oxygen.  <span />
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