Why does a child`s heart beat faster than an adult`s?

One of the functions of our circulation is temperature regulation. The relative amount of skin to the weight of an animal varies with the animal's size as follows: Using a sphere as an idealized creature, and using volume as an expression of mass, if you double the diameter you square the surface area but cube the volume (mass). That larger mass generates more heat relative to the surface area, so less blood flow to the skin is needed to dissipate the heat. When a baby loses a lot of heat through its skin, it has a hard time making enough heat to stay warm - it doesn't have enough mass. When an obese adult does a bit of physical work it needs to increase its heart rate and its sweating to stay even, heat-wise. These difference can be seen at rest and at a comfortable temperature as differences is baseline heart rate. More vividly, compare mouse to an elephant.

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