Most of the Ca²⁺ stored in the sarcoplasmic reticulum is bound to
A)parvalbumin.
B)troponin.
C)calsequestrin.
D)ryanodine.

Question

Quizplus · Accepted Answer

The majority of Ca²⁺ stored in the sarcoplasmic reticulum is bound to calsequestrin, a calcium-binding protein that helps regulate the release of Ca²⁺ by the ryanodine receptor during muscle contraction. Parvalbumin and troponin are calcium-binding proteins found in muscle fibers, but they do not play a major role in storing Ca²⁺ in the sarcoplasmic reticulum. Ryanodine is a chemical that can bind to and activate the ryanodine receptor, but it is not a calcium-binding protein involved in Ca²⁺ storage.

Most of the Ca²⁺ Stored in the Sarcoplasmic Reticulum Is