Which Muscle Type Depends Solely on the Sarcoplasmic Reticulum as Its

Question

Which muscle type depends solely on the sarcoplasmic reticulum as its calcium source?
A) Skeletal muscle
B) Smooth muscle
C) Cardiac muscle
D) Skeletal and smooth muscle
E) Smooth and cardiac muscle

Accepted Answer

Skeletal muscle relies exclusively on the sarcoplasmic reticulum for its calcium source, which is essential for muscle contraction. Smooth and cardiac muscles can also utilize extracellular calcium.