Receptor activity is regulated by:
A. Decreasing the number of receptors through internalization.
B. Decreasing the number of available receptors through inactivation.
C. Increasing the number of active receptors.
D. Both A and B
E. All of the above
ANS: E
Rationale: Cells can regulate receptor activity by decreasing the number of receptors through internalization, decreasing the number of functional receptors through inactivation, or increasing the number of active receptors in response to low neurotransmitter levels or infrequent receptor activation.
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