A.Sympathetic nerve fibres by releasing sympathin at free verve endings
B.By parasympathetic nerve fibres by releasing acetylcholine at their free nerve endings
C.Both of these nerve fibres
D.None of these fibres
A.Sympathetic nerve fibres by releasing sympathin at free verve endings
B.By parasympathetic nerve fibres by releasing acetylcholine at their free nerve endings
C.Both of these nerve fibres
D.None of these fibres