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Phases of Muscular Contraction

Multiple Choice Questions regarding lesson 14A phases of Muscular Contraction

LisaGray2
Created Date 11.25.20
Last Updated 11.25.20
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  • What are the four phases of muscle contraction in the correct sequence?
  • The phase that involves synaptic transmission at the neuromuscular junction and stimulation of the myofiber.
  • The phase in which muscle action potentials along the sarcolemma open intracellular calcium channels.
  • The phase when signal cessation signals the end of contraction and myofiber returns to its resting length.
  • The contraction phase also referred to the sliding myofilament model is
  • Which of the following is not a step of the excitation phase?
  • During the excitation-contraction coupling phase the muscular AP travels down to the T-tubules and _________. The voltage sensitive protein __________ changes shape and pulls the Ca2+ channel embedded in the SR, the (________) ,open. Ca2+ flows out of the SR and intracellular Ca2+ ___________.
  • During relaxation phase ACh ___________ and unbinds from nAChR ________ the channel stopping EPP. ATP-driven pumps _____________ will move Ca2+ out of sarcoplasm back into the SR where overall intracellular Ca2+____________. Regulatory complex moves back into blockage formation.
  • Is the action of myosin pulling actin inward (toward the m line) that occurs in the contraction phase.
  • During the contraction phase: calcium binds to _________ which shifts and moves _________. Myosin that bound to ATP, __________ it into ADP and Phosphate and is activated when _________.
  • Contraction phases repeats as long as long as there is _____________ in the sarcoplasm and as long as ____________ is available.
  • When does crossbridge break?
  • The repeated movement in which myosin heads pull the actin at the binding sites, detach, re-cock, attach to more binding sites, pull, detach, re-cock and repeat.
  • When muscle contraction stops...
  • What shortens during contraction?

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