What are the two neurotransmitters that affect smooth muscle cells?
* Acetylcholine (ACh): ACh is a neurotransmitter that is released by parasympathetic nerves. It causes smooth muscle cells to contract.* Norepinephrine (NE): NE is a neurotransmitter that is released by sympathetic nerves. It can cause either contraction or relaxation of smooth muscle cells, depending on the type of receptor that is activated.
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