The sarcolemma of the muscle fiber is the muscle cell membrane. It conducts an action potential along its membrane. It does not release Acetylcholine into the motor end plate. The correct answer is A. is the muscle cell membrane.
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All of the following statements are true regarding the action potential generated at the sarcolemma except A it triggers the release of calcium ions from the sarcoplasmic reticulum B It travels through the transverse tubules C It reaches the myofibrils within the muscle fiber D It triggers the release of acetylcholine from the sarcoplasmic reticulum
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What is the purpose of an action potential in a skeletal muscle fiber? A. Enable the muscle fiber to stimulate other, attached muscle fibers to contract B. Provide feedback to the neuron that contraction is taking place C. Muscle fibers do not conduct action potentials D. Open voltage-gated calcium channels in the sarcoplasmic reticulum (SR) E. Open voltage-gated sodium and potassium channels in the T-tubules
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Stimulation of a muscle fiber by a motor neuron occurs at a. the neuromuscular junction. b. the transverse tubules. c. the myofibril. d. the sarcoplasmic reticulum. e. none of the above.
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