transmission of nerve impulse to muscle 1-14

14 terms by x13windsor 

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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

5

sarcolemma becomes permeable to sodium (Na+), voltage gated sodium channels open

6

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

10

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

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