contestada

Heart beat is affected by ______ and ______.


size and shape

muscle and fat

hair color and eye color

male and female

Respuesta :

nataliegonzalez706

Answer:

I believe it´s muscle and fat......

Explanation:
Primary factors include blood volume reflexes, autonomic innervation, and hormones. Secondary factors include extracellular fluid ion concentration, body temperature, emotions, sex, and age.

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