receptors are located on parasympathetic postganglionic neurons, and receptors are located on parasympathetic target cells.

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Step 1: Understand the context of the question. The parasympathetic nervous system is part of the autonomic nervous system, which controls involuntary functions. It involves two types of neurons: preganglionic and postganglionic neurons, and their associated receptors.

Step 2: Recall that parasympathetic postganglionic neurons have receptors that respond to neurotransmitters released by preganglionic neurons. These receptors are typically nicotinic acetylcholine receptors, which are ionotropic and respond to acetylcholine.

Step 3: Identify the receptors located on parasympathetic target cells. These cells receive signals from postganglionic neurons, which release acetylcholine. The receptors on these target cells are muscarinic acetylcholine receptors, which are metabotropic and mediate various physiological responses.

Step 4: Differentiate between nicotinic and muscarinic receptors. Nicotinic receptors are found on postganglionic neurons and are involved in signal transmission, while muscarinic receptors are found on target cells and mediate the effects of the parasympathetic nervous system.

Step 5: Summarize the answer: Nicotinic receptors are located on parasympathetic postganglionic neurons, and muscarinic receptors are located on parasympathetic target cells.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Cholinergic Receptors

Cholinergic receptors are a type of receptor that responds to the neurotransmitter acetylcholine. They are classified into two main types: nicotinic and muscarinic receptors. Nicotinic receptors are found on the postganglionic neurons of the parasympathetic nervous system, while muscarinic receptors are located on the target cells that respond to parasympathetic stimulation.

Parasympathetic Nervous System

The parasympathetic nervous system is one of the two main divisions of the autonomic nervous system, responsible for promoting 'rest and digest' functions. It conserves energy by slowing down the heart rate, increasing intestinal and gland activity, and relaxing sphincter muscles. Understanding its role is crucial for identifying how cholinergic receptors function in the body.

Neurotransmission

Neurotransmission is the process by which signaling molecules called neurotransmitters are released by neurons and bind to receptors on target cells, leading to a response. In the context of the parasympathetic nervous system, acetylcholine is the primary neurotransmitter involved, facilitating communication between neurons and their target organs through cholinergic receptors.

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