Why would stroke volume increase when heart rate slows down?

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Why would stroke volume increase when heart rate slows down?
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The stroke volume will increase because the heart is giving itself more time in between contractions to fill up with blood. This is why an extremely high heart rate can be deadly. It doesn't allow the heart a proper amount of time to fill with blood, therefore very little blood is being pumped through the body. This is also why lower heart rates are often found in athletes. They are utilizing the time increase between contractions to fill up with blood. This means the maximum amount of potential from the heart is being derived.

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