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Physics Chemistry

CSS :: Circulatory System Physiology

  Slowing of heart rate in man is done by:
[A]. Sympathetic nerve fibres by releasing noradrenaline[B]. Parasympathetic nerve fibres by releasing acetylcholine
[C]. Sympathetic nerve fibres by releasing acetylcholine[D]. Parasympathetic nerve fibres by releasing noradrenaline

Answer: Option B
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