Question

Starling's law states that:

A) the greater the contraction, the higher the afterload.

B) the preload determines the cardiac output.

C) the more the myocardial muscle is stretched, the greater the
contraction.

D) for every action, there is an equal and opposite reaction.

Answer 1

Starling's Law of the Heart states that the more the myocardial muscle is stretched, the greater the contraction, which increases stroke volume and cardiac output.

Step-by-step explanation:

Starling's Law of the Heart, also known as Frank-Starling mechanism, states that the force of heart contraction is directly proportional to the initial length of the muscle fiber. Within physiological limits, the greater the stretch of the ventricular muscle, the more powerful the contraction. This increases stroke volume and cardiac output. Preload, which is the stretch on the ventricles prior to contraction, determines the initial length of the muscle fiber and therefore affects cardiac output. So, option C) is the correct answer.