Respuesta :
Some of the factors which contribute to a large stroke volume and low heart rate of endurance-trained athletes are an increased vagal tone and increased myocardial contractility.
What is myocardial contractility?
The natural ability of the heart muscle, also known as the myocardium, to contract is known as myocardial contractility. When muscles contract, different types of tissue are incrementally more or less bound together, namely between the filaments of thick myosin and thin actin tissue.
The amount of binding is determined by the quantity of calcium ions present in the cell. A catecholamine is released at precisely timed intervals to control the concentration of calcium ions in the cytosol of cardiac muscle cells, which in turn drives the sympathetic nervous system's activity or response inside of an in vivo intact heart.
A rise in intracellular calcium ions (Ca++) during contraction is how the factors increasing contractility work.
Learn more about cardiac muscle cells
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