When Ca²⁺ release channels in the sarcoplasmic reticulum of the heart are opened by an increase in Ca²⁺ in the cytoplasm,this is referred to as A)calcium-induced fibrillation. B)calcium-stimulated depolarization. C)calcium-stimulated calcium release. D)calcium-induced repolarization.

Question

Quizplus · Accepted Answer

When Ca2+ release channels in the sarcoplasmic reticulum of the heart are opened by an increase in Ca2+ in the cytoplasm, this is referred to as calcium-stimulated calcium release. This process plays a critical role in the excitation-contraction coupling of cardiac muscle. It allows Ca2+ to be released into the cytoplasm where it binds to troponin and initiates the sliding of actin and myosin filaments, leading to muscle contraction.

When Ca2+ Release Channels in the Sarcoplasmic Reticulum of the Heart

When Ca²⁺ Release Channels in the Sarcoplasmic Reticulum of the Heart