Relaxation of the Cardiomyocytes is Caused Mainly By

Question

Relaxation of the cardiomyocytes is caused mainly by A) Pumping Ca²⁺ out of the cytosol by the PMCA B) Pumping Ca²⁺ of the cytosol by NCX C) Removal Ca²⁺ out of the cytosol by SERCA2a D) Rem oving ATP from the rigor com plex of myosin E) Removing Ca²⁺ from the cytosol by the L-type Ca²⁺ channel

Accepted Answer

The relaxation of cardiomyocytes is primarily due to the reuptake of Ca²⁺ into the sarcoplasmic reticulum by the SERCA2a pump, which reduces cytosolic calcium levels and allows the muscle to relax.