What Is Responsible for the Phenomenon in Skeletal Muscle Known

question 41

Multiple Choice

What is responsible for the phenomenon in skeletal muscle known as muscle tone?

• A) the passive elastic properties of muscles and joints and some degree of alpha motor neuron activity
• B) spontaneous entry of calcium into the cytosol and the background phosphorylation of cross-bridges
• C) depletion of ATP in some individual muscle fibers, and the inability for cross-bridges to detach
• D) cross-bridges that continuously cycle, even in the absence of cytosolic Ca²⁺
• E) a buildup of K⁺ in the T-tubules and resulting depolarization of the sarcolemma

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