Neuromuscular Junction (NMJ)

Fill in the sequence of major events at the neuromuscular junction when an action potential has arrived at the axon terminal of a NMJ (summarize in a way that you can easily remember for the exam).

 

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E

D

C

B

A

A.

B.

C.

D.

E.

2. Excitation-Contraction Coupling: (answer in your own words)

 

A

B

C

A. What happens to the axon potential that arrives at the sarcolemma?

B. What happens once the action potential arrives at the terminal cisternae of sarcoplasmic recticulum?

C. What happens once calcium ions are released into the sarcoplasm?

3. Sliding-Filament Theory:

During a contraction:

A.,______ bands and ______ bands narrow.

B. Zones of overlap will _________________.

C. _____ lines will move closer together

D. _____ bands will remain constant in size.

E. ________________ will aid in restoring sarcomere length after contraction and resist extreme stretching of muscle fiber.

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