excitation phases

excitation phase 1 & 2

1. action potential arrives at axon terminal (end)

2. calcium enters axon terminal

3. release of acetylcholine

excitation phase 3 & 4

1. binding of ACh to receptor on the muscle membrane

2. sodium rushes into the muscle cell → DEPOLARIZATION → action potential

excitation phase 5

-repolarization

-creation of action potentials due to repolarization

excitation phase 6 & 7

1. action potential goes down tubule (in the muscle)

2.calcium released from terminal cisterns because of action potential