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18
Summary of Skeletal Muscle Contraction (Steps 1-5)
1. AP travels along axon to NMJ
2. Ca2+ channels open, Ca2+ enters presynaptic terminal
3. Ach released from synaptic vesicles in presynaptic terminal
4. Ach diffuses across synaptic cleft, binds to receptor sites on Na+ channels in muscle postsynaptic membrane, Na+ channels open
5. Na+ diffuse into muscle cell initiating AP which travels along sarcolemma and T tubules
2. Ca2+ channels open, Ca2+ enters presynaptic terminal
3. Ach released from synaptic vesicles in presynaptic terminal
4. Ach diffuses across synaptic cleft, binds to receptor sites on Na+ channels in muscle postsynaptic membrane, Na+ channels open
5. Na+ diffuse into muscle cell initiating AP which travels along sarcolemma and T tubules
