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Cardiac contractions are caused by an influx of calcium into heart muscle cells from outside the cell and from internal stores. This calcium enables the protein myosin to bind to actin, causing the muscle to contract. The amount of blood pumped out with each contraction, known as the stroke volume, must match the amount returning to the heart. According to the Frank-Starling law, the force of contraction increases when the heart muscle is stretched more at the end of filling. There are two main types of hea

Author
Michael Hii
Language
EN

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