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Which of the following does NOT occur in or immediately prior to a muscle contraction? action potential in motor neuron acetylcholine released into synaptic cleft temporary localized changes in the membrane potential of the sarcolemma and t-tubules sacroplasmic recticulum releases acetylcholine active sites on actin molecules are exposed During contraction of a muscle, calcium ions bind to the _______.” actin and myosin filaments troponin molecule tropomyosin molecule sarcoplasmic reticulum sarcolemma Which of the following is NOT a role of ionic calcium in muscle contraction? triggers neurotransmitter secretion binds with troponin removes contraction inhibitor spreads the depolarization from the neuromuscular junction to the T-tubules

- November 14, 2022 - Edwin Tunner

Which of the following does NOT occur in or immediately prior to a muscle contraction?

  1. action potential in motor neuron
  2. acetylcholine released into synaptic cleft
  3. temporary localized changes in the membrane potential of the sarcolemma and t-tubules
  4. sacroplasmic recticulum releases acetylcholine
  5. active sites on actin molecules are exposed

During contraction of a muscle, calcium ions bind to the _______.”

  1. actin and myosin filaments
  2. troponin molecule
  3. tropomyosin molecule
  4. sarcoplasmic reticulum
  5. sarcolemma

Which of the following is NOT a role of ionic calcium in muscle contraction?

  1. triggers neurotransmitter secretion
  2. binds with troponin
  3. removes contraction inhibitor
  4. spreads the depolarization from the neuromuscular junction to the T-tubules

The role of tropomyosin in a muscle cell is to ____.

  1. all to cell to relax by blocking the binding sites on actin
  2. facilitate the formation of cross-bridges between actin and myosin

Interactions between thick and thin filaments during muscle contraction occur in which sequence?

  1. “attach to actin, detach from actin, pivot in powerstroke, return or recock”
  2. “attach to actin, pivot in powerstroke, detach from actin, return or recock”
  3. “attach to actin, pivot in powerstroke, return or recock, detach from actin”
  4. “detach from actin,pivot in powerstroke, attach to actin, return or recock”

What is the role of calcium pump in muscle contractions?

  1. pump calcium out of the sarcoplasmic reticulum against its concentration gradient to initiate contractions
  2. remove calcium from the fluid surrounding the myofibrils to end contractions
  3. pump calcium into the muscle cell to stimulate the release of acetylcholine

Rigor mortis demonstrates that skeletal muscle tissue

  1. normally requires energy to end as well as to start a contraction
  2. can survive and function for some time after the heart stops beating
  3. “maintains powerful contractions even with no ATP, until autolysis occurs”
  4. all of the above
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