P3.6 - Heart Electricity.

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  • Created by: Chris
  • Created on: 26-05-10 15:18

Basal metabolic rate (BMR): This is the minimum amount of energy required to survive 24 hours; it’s about 7 million Joules (7MJ) a day, but varies depending on age, sex and health. It is also about 81 Joules each second (or a power rating of 81 Watts).

The muscle cells can generate potential differences can be used in medical applications: In each heart beat, in the Sino-Atrial Node, a bundle of specialised cardiac cells starts a wave of depolarisation; this is a change of charge that is passed along through muscle cells causing them to contract in sequence; this squeezes blood first from the atria into the ventricles, and then, after a short delay the wave of depolarisation of energy reaches the atrio-ventricular


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