Why is the contraction strength of smooth muscle relatively independent of its resting length? A) It gets nearly all of its Ca²⁺ from the extracellular fluid. B) It does not have intercalated discs. C) It does not have sarcomeres. D) It is regulated by a length-tension relationship. E) It is involuntary muscle.

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Quizplus · Accepted Answer

Smooth muscle contraction strength is relatively independent of its resting length because it does not have sarcomeres, which are the structural units of striated muscle that give it the striated appearance and are responsible for the length-tension relationship observed in skeletal and cardiac muscles.

Why Is the Contraction Strength of Smooth Muscle Relatively Independent