What do you understand by cholinergic and anti-cholinergic agents? How do they work? Discuss the common drugs used as cholinergic agents.

Cholinergic and anticholinergic agents are two categories of drugs that have opposing effects on the cholinergic system in the body. The cholinergic system is primarily responsible for transmitting nerve signals by using the neurotransmitter acetylcholine. These drugs are important in pharmacology and toxicology as they can have a significant impact on various physiological processes.

1. Cholinergic Agents:

Cholinergic agents, also known as cholinergic agonists or parasympathomimetics, are drugs that mimic the effects of acetylcholine, either by directly stimulating cholinergic receptors or by increasing the levels of acetylcholine in synapses. They work by enhancing the activity of the parasympathetic nervous system, also known as the "rest and digest" system, which is responsible for regulating various bodily functions, including heart __________ ________ ______ __________ ___ __________ _____ ____ _____ ______ ________ ________.
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