What is the primary action of Atropine Sulfate in the body?

Atropine Sulfate primarily acts by inhibiting the muscarinic actions of acetylcholine, which is a neurotransmitter in the body. It does this by blocking the muscarinic receptors that acetylcholine would typically bind to, preventing a response typically mediated by the parasympathetic nervous system. This inhibition leads to various effects, such as increased heart rate, decreased secretions, and reduced smooth muscle contractions in the gastrointestinal tract. Thus, when atropine is administered, it counteracts the effects of acetylcholine, which is particularly useful in cases of bradycardia or as an antidote for certain types of poisoning.