Which of the following is true about parasympathetic nervous system ?
Correct answer: A. Ach is transmitter at both pre & post synaptic junction
- A. Ach is transmitter at both pre & post synaptic junction
- B. It causes dilatation of skeletal muscles
- C. Post ganglionic fibres are longer than pre ganglionic fibres
- D. Noradrenalin is the neurotransmitter at post ganglionic junction
Explanation
All parasympathetic preganglionic and postganglionic neurons release acetylcholine, acting at nicotinic ganglia and muscarinic effector receptors respectively. Parasympathetic postganglionic fibres are generally short, and noradrenaline is not their usual transmitter.
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