In smooth muscle, most of the Ca 2+ needed for muscle contraction

In smooth muscle, the calcium ions necessary for muscle contraction primarily enter from the extracellular fluid, unlike skeletal muscle where calcium is stored and released from the sarcoplasmic reticulum.

In smooth muscle, most of the Ca 2+ needed for muscle contraction

In smooth muscle, the calcium ions necessary for muscle contraction primarily enter from the extracellular fluid, unlike skeletal muscle where calcium is stored and released from the sarcoplasmic reticulum.

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In Smooth Muscle, Most of the Ca²⁺ Needed for Muscle

Question 148

Multiple Choice

In smooth muscle, most of the Ca²⁺ needed for muscle contraction

A) is in the dense bodies.
B) enters from extracellular fluid.
C) is attached to the intermediate filaments.
D) must be activated by myosin kinase.
E) is stored in the sarcoplasmic reticulum.

Correct Answer: