The relaxation of skeletal muscle relies on the activity of the ________, which decreases cytoplasmic calcium concentration.
A) ryanodine receptor
B) dihydropyridine (DHP) receptor (L-type calcium channel)
C) acetylcholine receptor
D) Ca²⁺ ATPase

Question

Quizplus · Accepted Answer

The Ca²⁺ ATPase pumps calcium ions out of the cytoplasm and into the sarcoplasmic reticulum, decreasing cytoplasmic calcium concentration and allowing for muscle relaxation. The ryanodine receptor and dihydropyridine (DHP) receptor are involved in muscle contraction, while the acetylcholine receptor is involved in neuromuscular transmission.

The Relaxation of Skeletal Muscle Relies on the Activity of the ________