Altering heart rate is necessary to increase the supply of oxygen and glucose to cells, particularly during exercise or danger, to meet increased metabolic demands.
Es necesario poder alterar la frecuencia cardíaca para aumentar el suministro de oxígeno y glucosa a las células, especialmente durante el ejercicio o en situaciones de peligro, para satisfacer las demandas metabólicas incrementadas.
| Front | Explain why there is a need to be able to alter heart rate in humans. |
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| Back | Need for altering heart rate:
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