If the pathway shown in the diagram is a parasympathetic division pathway,which neurotransmitter acts at the effector? 
Definitions:
Anhedonia
The inability to feel pleasure in normally pleasurable activities, often associated with depression and other mental health disorders.
Dysthymia
A persistent depressive disorder characterized by a chronic form of depression with less severe symptoms than major depressive disorder.
Euphoria
A feeling or state of intense excitement and happiness.
Anergia
A lack of energy or physical strength, often seen as a symptom in depressive disorders or chronic health conditions.
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