What is the difference between "contractility" and "force of contraction" of cardiac muscle?

Very complicated. This gets pretty nuanced! Contractility is a concept that refers to the inherent ability for heart muscle cells or the heart in general to develop a certain amount of force for the same given amount of stretch (preload) and load (afterload). Force of contraction is how hard the muscle or the heart is contracting no matter what the loading conditions are.

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What is the difference between contractility and force of contraction of cardiac muscle?

Contractility. Contractility is the property of how much the heart muscle can contract. Force of contraction is the actual force generated by the result of the contractility property. Read more...