3-11. Place the following events (a-j) n their proper sequence by writing out th

Question

3-11. Place the following events (a-j) n their proper sequence by writing out the steps in order on the right hand side of your journal. a. Acetyl choline is released into the synaptic cleft. b. Action potential is generated on the sarcolemma and propagates along the membrane and down the T Tubules. c. Calcium ions enter the axon terminal and synaptic vesicles fuse to membrane of axon terminal. d. Motor end plate of sarcolemma becomes depolarized. e. Calcium ions bind to the troponin on the actin filaments exposing active sites. f. Action potential arrives at the axon terminal. g. Calcium ions are released from the terminal cisternae. h. Acetylcholine binds to receptor sites on the motor end plate. )i. The muscle cell contracts. Myosin heads bind to the active sites on actin.

Explanation / Answer

1. Action potential arrives at axon terminal.

2. Calcium ions enter the axon terminal and synaptic vesicles fuse to the membrane of axon terminal.

3. Acetylcholine is released into the synaptic cleft.

4. calcium ions are released from terminal cisternae.

5. Acetylcholine bindsto receptor sites on the motor end plate.

6. Action potential is generated on the sarcolemma and propagates along the membrane and down the T tubules.

7. calcium ions bind to troponin on the actin filaments exposing active sites.

8. Myosin heads binds to active sites on actin.

9. The muscle cell contracts.

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