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14 terms

transmission of nerve impulse to muscle 1-14

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1
nerve impulse reaches the axon terminal
2
acetylchline (ACh) is released from the axon terminal
3
ACh crosses the synaptic cleft
4
attaches to ACh receptors on the sarcolemma
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sarcolemma becomes permeable to sodium (Na+), voltage gated sodium channels open
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the sodium rushes in. voltage gated sodium channels close
7
the voltage gated potassium channels open. K rushes out. following this, the voltage gated potassium channels close
8
this movement of ions causes a depolarization and repolarization of the sarcolemma called an action potential
9
this action potential travels the length of the muscle fiber
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once started, it cannot be stopped
11
the action potential travels to interior of muscle fiber by T tubules
12
this triggers the release of calcium ions from the sarcoplasmic reticulum
13
calcium binds to troponin on actin molecule
14
crossbridge forms between actin and mysin