GROSS ANATOMY

Detailed explanation-1: -Atropine competes for a common binding site on all muscarinic receptor. Cardiac muscle muscarinic receptors are blocked. Muscarinic receptors in exocrine glands, smooth and ganglia and intramural neurons are also blocked by atropine.

Detailed explanation-2: -Cholinergic receptors are receptors on the surface of cells that get activated when they bind a type of neurotransmitter called acetylcholine. There are two types of cholinergic receptors, called nicotinic and muscarinic receptors-named after the drugs that work on them.

Detailed explanation-3: -[1] The molecule acetylcholine activates muscarinic receptors, allowing for a parasympathetic reaction in any organs and tissues where the receptor is expressed.

Detailed explanation-4: -The N2 or neuronal nicotinic receptor subtype exists on all postganglionic cell bodies. The N2 receptors are responsive to acetylcholine and transmit signals from the preganglionic to the postganglionic cell.