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Your heart is the toughest, most active muscle in the human body. Like any other muscle, it will conserve energy and its consumption of oxygen. Otherwise, if your heart rate didn't decrease, your heart would use up all the oxygen in the body, eventually killing your brain and other organs.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoA persons heart rate changes becasue the nervous system tells it to.
Wiki User
∙ 14y agoHeart rate changes in response to the bodies need for blood (and its energy supplies), without it (the change) you could not lift a finger without passing out.
Wiki User
∙ 13y agowhen your exercising your heart changes its rate. The reason why is because your body needs more oxygen and when your heart is racing blood cells carry oxygen around your body.
Wiki User
∙ 12y agothe heart rate of humans changes at different rates because it rises up to peaks when large masses or exercise or things that make the human body exhaust happen
Wiki User
∙ 14y agoexercise ! =]
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