What type of cholinergic receptors are muscarinic receptors?

Muscarinic receptors are a subtype of cholinergic receptors that are primarily located postsynaptically. These receptors respond to the neurotransmitter acetylcholine and are found in various tissues and organs, including the heart, smooth muscles, and glands. Their activation leads to a range of physiological effects such as increased glandular secretions, decreased heart rate, and contraction of smooth muscle.

While cholinergic receptors can also be found presynaptically, muscarinic receptors are predominantly recognized for their postsynaptic role. They are part of the parasympathetic nervous system and play a key role in mediating the effects of acetylcholine in target tissues.

The other options may refer to other types of receptors, but in the context of muscarinic receptors specifically, it's clear that their primary action occurs at the postsynaptic sites.