April-October (High Season): you need at least 5 nights in Santorini as you will spend lots of time on the beaches. November-March (Low Season): you need at least 3 nights in Santorini and do other things. Ideal: 10 days in Santorini during the best time of the year for the island. Over 3 nights in Greece: at least 50% of your time in Greece should be spent in Santorini and at least 25% in Mykonos. Less than 3 nights in Greece: 2 nights Santorini and 1 night Athens if you are flying through Athens or 3 nights only in Santorini if you are flying directly to Santorini.
The postganglionic neurons of sweat glands release acetylcholine for the activation of muscarinic receptors. The chromaffin cells of the adrenal medulla are analogous to post-ganglionic neuronsâthe adrenal medulla develops in tandem with the sympathetic nervous system and acts as a modified sympathetic ganglion.
ACh is the neurotransmitter within these ganglia, and the ACh binds to nicotinic receptors on postganglionic neurons (see the following figure). From these neurons arise relatively long postganglionic fibers that travel to their target organ and release norepinephrine as the primary neurotransmitter.