Why do children's hearts beat faster?

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Offline Jessica H

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Why do children's hearts beat faster?
« on: 31/10/2010 02:43:20 »
The heartrate of a child is much faster than an adult, and small animals have very rapid heartbeats.  Why is that so?

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Offline RD

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Why do children's hearts beat faster?
« Reply #1 on: 31/10/2010 05:26:55 »
Child has larger surface area to volume ratio than adult, (because is smaller): so child has more heat loss per unit area, so needs a higher metabolic rate than an adult to maintain the same body temperature.

Child also has an additional metabolic load because it is growing, (adult isnít).


http://en.wikipedia.org/wiki/Kleiber%27s_law
« Last Edit: 31/10/2010 05:35:54 by RD »