Which statement correctly describes the parasympathetic nervous system?

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Acetylcholine acts as the neurotransmitter at both preganglionic and postganglionic synapses.It leads to the expansion of blood vessels supplying skeletal muscles.The postganglionic fibers are longer in length than the preganglionic fibers.Noradrenaline is released at the postganglionic synapse.

Explanation

Option A is correct because acetylcholine is the neurotransmitter released at both the preganglionic and postganglionic synapses in the parasympathetic nervous system. The other options are incorrect: the parasympathetic system does not cause dilation of skeletal muscle blood vessels, the postganglionic fibers are typically shorter than preganglionic fibers, and noradrenaline is not the neurotransmitter used at the postganglionic junction.