What helps to prevent overstimulation of effector sites on nerve membranes?
A) Alpha1-receptors
B) Alpha2-receptors
C) Beta1-receptors
D) Beta2-receptors
C
Feedback:
Alpha2-receptors are located on nerve membranes and act as modulators of norepinephrine release. When norepinephrine is released from a nerve ending, it crosses the synaptic cleft to react with its specific receptor site. Some of it also flows back to react with the alpha-receptor on the nerve membrane. This causes a reflex decrease in norepinephrine release. In this way, the Alpha2-receptor helps to prevent overstimulation of effector sites.
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