Respiration and the heart

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Chewysambe
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The heart muscle needs a supply of energy to power its contractions. During exercise, how will the energy of the heart muscle itself change?

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Puddles the Monkey
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(Original post by Chewysambe)
The heart muscle needs a supply of energy to power its contractions. During exercise, how will the energy of the heart muscle itself change?

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Heya, I'm going to put this in the Biology forum for you as you should get more responses there.
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notathuggee
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(Original post by Chewysambe)
The heart muscle needs a supply of energy to power its contractions. During exercise, how will the energy of the heart muscle itself change?

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The heart muscle contracts to pump blood around the body.
These contractions need a supply of energy.
During exercise, a higher rate of blood flow is needed to supply muscles with glucose and oxygen for respiration and to remove waste products such as carbon dioxide.
In order to increase the rate of blood flow, heart rate must increase.
Therefore, during exercise heart rate increases, so it contracts more.
So the heart needs more energy to power the increase in contractions.

tldr: during exercise, energy supply to heart muscle must go up
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