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Ronald, a Recovering Alcoholic, Has Not Had a Drink in Seven

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Ronald, a recovering alcoholic, has not had a drink in seven months. He has stopped visiting all of his regular bars and has lost his craving for alcohol. When his boss invites him out to "his favorite" bar one day after work, Ronald gets an overwhelming desire to have a drink. What is Ronald demonstrating?


Definitions:

Neuromuscular Junction

Region where an axon bulb approaches a muscle fiber; contains a presynaptic membrane, a synaptic cleft, and a postsynaptic membrane.

Synapse

Junction between neurons consisting of the presynaptic (axon) membrane, the synaptic cleft, and the postsynaptic (usually dendrite) membrane.

Antagonistic Muscle

Pairs of muscles that work against each other to move body parts, such as the biceps and triceps for arm movement.

Quadriceps Femoris Group

A group of four muscles located in the front of the thigh, responsible for extending the leg at the knee joint.

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