Provide the name of the compound shown. 
Definitions:
Knee-Jerk Reflex
The knee-jerk reflex is a sudden kicking movement of the lower leg in response to a sharp tap on the patellar tendon.
Interneurons
A type of neuron that transmits impulses between other neurons, especially as part of a reflex arc.
Sympathetic Nervous System
A part of the autonomic nervous system that prepares the body for action by increasing heart rate, blood pressure, and energy production.
Opiatelike Neurotransmitters
Substances in the brain that act on the same receptors as opiates, playing key roles in pain relief and pleasure.
Q21: With each structure below drawn in its
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