The Capacity of Morphine and Codeine to Provide Excellent Pain

Multiple Choice

The capacity of morphine and codeine to provide excellent pain relief occurs because these drugs

A) inhibit the uptake of serotonin.
B) cause the loss of physical sensation.
C) exert analgesic properties that resemble those of the body's endorphins.
D) increase central nervous system activity.
E) cause temporary failure within the cerebrum.