Mu1 receptor activation is associated with which combination of effects?

Mu1 receptor activation is associated with which combination of effects?

• A. Respiratory depression, constipation, analgesia (spinal only)
• B. Analgesia (supraspinal and spinal), bradycardia, euphoria, low abuse potential, miosis, hypothermia, urinary retention
• C. Analgesia only at spinal level with no other effects
• D. Immune suppression

Answer: (B)

Mu1 receptor activation yields analgesia at both supraspinal and spinal levels and comes with a characteristic set of autonomic and psychotropic effects: bradycardia, miosis, hypothermia, urinary retention, and euphoria. This combination reflects how mu1 mediates not only pain relief but also these specific autonomic and rewarding properties. Because the scenario includes analgesia in both brain and spinal cord plus bradycardia, miosis, hypothermia, urinary retention, and euphoria, it fits the mu1 profile best. Respiratory depression and constipation are more strongly linked to other mu receptor subtypes, and restricting analgesia to the spinal level or citing immune suppression alone would not capture the full mu1-associated effect pattern.

Mu1 receptor activation yields analgesia at both supraspinal and spinal levels and comes with a characteristic set of autonomic and psychotropic effects: bradycardia, miosis, hypothermia, urinary retention, and euphoria. This combination reflects how mu1 mediates not only pain relief but also these specific autonomic and rewarding properties. Because the scenario includes analgesia in both brain and spinal cord plus bradycardia, miosis, hypothermia, urinary retention, and euphoria, it fits the mu1 profile best. Respiratory depression and constipation are more strongly linked to other mu receptor subtypes, and restricting analgesia to the spinal level or citing immune suppression alone would not capture the full mu1-associated effect pattern.