The Nervous System A2 Biology- Mammalian nervous system. A short quiz 3.5 / 5 based on 10 ratings ? BiologyHuman, animal and plant physiologyA2/A-levelAll boards Created by: LouiseCreated on: 05-04-09 21:30 When pupils dilate, it is due to the autonomic nervous system, but which sub-system is it? Sympathetic 1 of 2 What is the main neurotransmitter used in the parasympathetic system? Acetylcholine 2 of 2
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