For a skeletal muscle fiber twitch, place the following events in order (1 = first, 4 = last). Group of answer choices Calcium binding to troponin [ Choose ] Acetylcholine release at motor endplate [ Choose ] Calcium release from sarcoplasmic reticulum [ Choose ] Conformational change in myosin [ Choose ]
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Step 1: Acetylcholine is released at the motor endplate, triggering an action potential in the muscle fiber. Show more…
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The calcium that directly induces skeletal muscle contraction SELECT ALL THAT APPLY. For this question, you get partial credit for each correct answer choice, but points are deducted for incorrect answer choices, so only select the answer choices you are confident about: - Binds to troponin - Is released to the extracellular space after contraction - Helps to unblock myosin binding sites - Comes from the extracellular space
Sri K.
In order to form a cross bridge in skeletal muscle sarcomeres, calcium must bind to ____ and shift ____ away from the binding site. Group of answer choices Tropomyosin : troponin Troponin : tropomyosin Myosin : actin Actin : myosin
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In skeletal muscle fibers, which one of the following has ATPase activity? Actin, Myosin, Troponin I, Troponin-C, Tropomyosin. Which one of the following DOES occur in skeletal muscle contraction? a. The SR releases calcium ions b. Calcium ions bind to tropomyosin c. Actin shortens d. Myosin lengthens. Which one of the following is the usual signaling agent at the neuromuscular junction? a. Dopamine b. Acetylcholine c. Neurophysin.
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