Which of the Following Statements Regarding Contraction of a Skeletal

question 53

Multiple Choice

Which of the following statements regarding contraction of a skeletal muscle fiber is TRUE?

• A)Thick filaments shorten when muscle cells contract.
• B)Some contractions occur without cross-bridge activation.
• C)Contracting muscle fibers do not always shorten.
• D)Contraction does not always require the occurrence of an action potential.
• E)Contraction only occurs following summation of action potentials from many motor neurons.

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