Which type of receptor has nicotine as its agonist?

Nicotinic receptors are a specific type of acetylcholine receptor that responds to neurotransmitters. They are found in both the central nervous system and the peripheral nervous system, particularly at the neuromuscular junction where they mediate actions such as muscle contraction. Nicotine, a major active substance in tobacco, acts as an agonist for nicotinic receptors, meaning it binds to these receptors and activates them, leading to a variety of physiological responses, such as increased heart rate and adrenaline release.

In contrast, muscarinic receptors, another type of acetylcholine receptor, are primarily responsive to acetylcholine and are involved in parasympathetic nervous system functions. Alpha and beta receptors, often referred to as adrenergic receptors, respond to catecholamines like norepinephrine and epinephrine, not acetylcholine or nicotine. Understanding the distinct roles of these receptors is crucial for grasping pharmacological concepts related to the effects of various substances, including nicotine.