The strength of contraction of the heart can be increased by increasing the degree of filling of the heart. This occurs because as you fill the heart with more blood

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the cardiac muscle cells are stretched to longer lengths and this allows them to contract with greater force.

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more of the cardiac muscle cells within the wall of the heart are recruited to contract.

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more oxygen is available to the cardiac muscle cells, allowing them to contract with greater force.

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All 3 of the above mechanisms contribute to the increased strength of contraction.

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The strength of contraction of the heart can be increased by increasing the degr...

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