Which of the following releases calcium ions upon receiving nervous stimulation from the motor neurons?

Question

Quizplus · Accepted Answer

Nervous stimulation from motor neurons causes the release of calcium ions from the sarcoplasmic reticulum.
Calcium ions attach to inhibitory proteins on the actin filaments within the cell, moving them aside so that cross-bridges can form between actin and myosin filaments. Using energy supplied by ATP, the filaments slide together to produce a contraction.
Each muscle cell consists of myofibrils which in turn are made up of still smaller units called sarcomeres.

Which of the Following Releases Calcium Ions Upon Receiving Nervous