Indicate the Proper Sequence of Events at the Neuromuscular Junction

question 29

Short Answer

Indicate the proper sequence of events at the neuromuscular junction by filling in the blank with the appropriate number from 2 through 7. Numbers 1 and 8 are already identified.

_____ ACh is released from the axon terminal by exocytosis.
_____ An EPP takes place, primarily as a result of Na⁺ influx.
__8___ Acetylcholinesterase inactivates ACh, terminating activity at the neuromuscular junction.
___1__ An action potential is propagated to an axon terminal of a motor neuron.
_____ Channels that permit passage of Na⁺ and K⁺ are opened in the motor end plate.
_____ Ca²⁺ channels are opened in the axon terminal.
_____ Local current flow between the motor end plate and adjacent muscle-cell membrane initiates an action potential that spreads throughout the muscle fiber.
_____ ACh binds with receptor sites on the motor end plate.

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Definitions:

Reinforcement

In behavioral psychology, a process by which a behavior is strengthened or increased by its consequences.

Positive Reinforcement

A method of behavior modification that involves rewarding a desired behavior in order to increase the likelihood of it occurring again.

Watson

Psychologist John B. Watson, known as the father of behaviorism, emphasized the study of observable behavior.

Thorndike

An American psychologist known for his work on learning theory that led to the development of operant conditioning within behaviorism.