The major function of the sarcoplasmic reticulum in muscle contraction is to ________.
A) make and store phosphocreatine
B) synthesize actin and myosin myofilaments
C) provide a source of myosin for the contraction process
D) regulate intracellular calcium concentration

Question

Quizplus · Accepted Answer

The sarcoplasmic reticulum stores and releases calcium ions which are crucial for muscle contraction. When a muscle cell is stimulated, calcium ions are released from the sarcoplasmic reticulum and allow for the binding of myosin to actin, initiating the contraction process. Therefore, the major function of the sarcoplasmic reticulum in muscle contraction is to regulate intracellular calcium concentration.

The Major Function of the Sarcoplasmic Reticulum in Muscle Contraction