The strength of cardiac muscle contraction for a particular preload (ionotropic effect) is regulated by

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Quizplus · Accepted Answer

The strength of cardiac muscle contraction is regulated by the level of calcium in the blood. Calcium plays a crucial role in the contraction of cardiac muscle, as it allows for the interaction between actin and myosin filaments. An increase in calcium levels leads to an increase in the strength of contraction, while a decrease in calcium levels leads to a decrease in the strength of contraction. The other options, degree of activation of motor neurons, level of amino acids in blood and presence or absence of inflammatory mediators, do not directly regulate the strength of cardiac muscle contraction.

The Strength of Cardiac Muscle Contraction for a Particular Preload