Which of the Following Statements Is True Regarding Skeletal-Muscle Contraction

question 56

Multiple Choice

Which of the following statements is true regarding skeletal-muscle contraction?

• A)The cross-bridge cycle refers to the sequence of events between the time an individual cross bridge binds to a thin filament at the start of a muscle contraction and the time the cross bridge releases the filament at the end of the contraction
• B)Excitation-contraction coupling refers to the binding of energized myosin to actin
• C)Binding of myosin to actin cannot take place in the absence of calcium ion
• D)A single twitch in skeletal muscle lasts about as long as the action potential that caused it
• E)All of the choices are true

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