Stretch increases the force of cardiac contraction mainly by A) Increasing the size of the Ca²⁺ transient B) Increasing the sensitivity of the myofilaments for Ca²⁺ C) Increasing the turnover number of activated acto-myosin cross bridges D) Decreasing the jamming of the myofilaments at short lengths E) Increasing stretch of passive elements

Question

Quizplus · Accepted Answer

Stretch increases the force of cardiac contraction mainly by increasing the sensitivity of the myofilaments for Ca²⁺, which is known as the Frank-Starling mechanism.

Stretch Increases the Force of Cardiac Contraction Mainly by