McGraw-Hill Online Learning Center Test

1. Review the image and answer the following questions.

What happens when a drug molecule binds to the transportation molecules?

A. Reabsorption of the neurotransmitter is facilitated, and the post-synaptic cell is under-stimulated.
B. Reabsorption of the neurotransmitter is blocked, and the post-synaptic cell is over-stimulated.
C. Additional neurotransmitter is released.
D. The drug functions as a neurotransmitter, sending new signals.

2. How does the central nervous system adjust to the perpetual use of a narcotic drug?

A. The presence of the narcotic reduces the excretion of all central nervous system transmitters.
B. The narcotic leads to rapid degeneration of brain tissues.
C. It adjusts to the increased firing of the post-synaptic cell by producing fewer receptors in the post-synaptic membrane, leading to addiction.
D. The narcotic causes the overgrowth of neuroglial cells in the brain.

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