Adrenergic

Adrenergic refers to the physiological and pharmacological processes involving the neurotransmitter adrenaline (also known as epinephrine) and noradrenaline (also known as norepinephrine). These processes are primarily mediated by the adrenergic receptors, which are a class of G protein-coupled receptors.

Adrenergic Receptors

Adrenergic receptors are divided into two main types: alpha-adrenergic receptors and beta-adrenergic receptors. Each type has subtypes:

• Alpha-adrenergic receptors:

 * Alpha-1 adrenergic receptor
 * Alpha-2 adrenergic receptor

• Beta-adrenergic receptors:

 * Beta-1 adrenergic receptor
 * Beta-2 adrenergic receptor
 * Beta-3 adrenergic receptor

Function

Adrenergic receptors are involved in a wide range of physiological responses, including:

• Fight-or-flight response
• Regulation of heart rate
• Vasoconstriction and vasodilation
• Bronchodilation
• Metabolic regulation

Adrenergic Agonists and Antagonists

Adrenergic agonists are drugs that stimulate adrenergic receptors, while adrenergic antagonists block these receptors. Examples include:

• Agonists:

 * Epinephrine
 * Norepinephrine
 * Isoproterenol

• Antagonists:

 * Propranolol
 * Prazosin
 * Atenolol

Clinical Applications

Adrenergic drugs are used in the treatment of various conditions such as:

• Hypertension
• Asthma
• Cardiac arrest
• Anaphylaxis

See Also

• Sympathetic nervous system
• Parasympathetic nervous system
• Neurotransmitter
• Autonomic nervous system