Which Statement About Insect Muscles Is True

question 2

Multiple Choice

Which statement about insect muscles is true?

• A) Unlike insect flight muscles, vertebrate striated muscles are described as asynchronous, because the cycling of the contractile mechanism is unlinked to firing of motor neurons.
• B) The incredibly fast wingbeat frequencies produced by insect fight muscles result from the equally fast firing of action potentials in insect flight motor neurons.
• C) Contraction of a fiber in an insect flight muscle does not involve calcium ions.
• D) Once a fiber in an insect flight muscle is stimulated, the cycle of contraction and relaxation proceeds at its own specific frequency, provided that calcium is available for binding to troponin.
• E) Contraction of an insect flight muscle occurs in the absence of troponin.

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