During the Contraction of a Vertebrate Skeletal Muscle Fiber, Calcium

question 2

Multiple Choice

During the contraction of a vertebrate skeletal muscle fiber, calcium ions ________.

• A) break cross-bridges as a cofactor in hydrolysis of ATP
• B) bind with troponin, changing its shape so that the myosin-binding sites on actin are exposed
• C) transmit action potentials from the motor neuron to the muscle fiber
• D) spread action potentials through the T tubules

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