The primary reservoir for calcium that is released during excitation-contraction coupling in a skeletal muscle fiber is the
A)sarcoplasmic reticulum.
B)endoplasmic reticulum.
C)transverse tubules.
D)Golgi bodies.
E)troponin.

Question

Quizplus · Accepted Answer

The sarcoplasmic reticulum is the primary reservoir for calcium in skeletal muscle fibers. When an action potential travels along the transverse tubules, it triggers the release of calcium from the sarcoplasmic reticulum, which then binds to troponin and initiates muscle contraction. The other options listed are not involved in calcium release during excitation-contraction coupling.

The Primary Reservoir for Calcium That Is Released During Excitation-Contraction