Muscle Contractions

Card Set Information

Author:
alyssau12
ID:
287297
Filename:
Muscle Contractions
Updated:
2014-10-28 00:48:09
Tags:
ANSC
Folders:

Description:
animal anatomy & physiology
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  1. How do skeletal muscles contract?
    • 1. action potential is initiated by the firing of a motor neuron
    • 2. depolarization of the motor nerve ending releases ACh
    • 3. ACh diffuses across synaptic cleft and binds to membrane receptors
    • 4. membrane channels open and allow Na+ to enter the muscle cell
    • 5. entry of Na+ shifts membrane potential in a positive direction and polarization occurs
  2. What triggers a skeletal muscle contraction?
    generation of an action potential on the sarcolemma
  3. What's different about smooth muscle contractions?
    • brought about by variable stimuli
    • contraction is much slower
  4. What's different about cardiac muscle contractions?
    • don't require nerve stimulation but still need an AP
    • AP slower than in skeletal muscles
    • contraction time and AP are the same

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