Adrenergic receptor

<p>The adrenergic receptors or adrenoceptors are a class of <a href="/facts/G_protein-coupled_receptor/0arUMkQc">G protein-coupled receptors</a> that are targets of many <a href="/facts/Catecholamine/hHFrCMgM">catecholamines</a> like <a href="/facts/Norepinephrine/AjTIC9ox">norepinephrine</a> (noradrenaline) and <a href="/facts/Epinephrine/k7vvMI7E">epinephrine</a> (adrenaline) produced by the body, but also many medications like <a href="/facts/Beta_blocker/PRsWgpLV">beta blockers</a>, <a href="/facts/Beta-2_adrenergic_receptor/erywpzGl">beta-2 (β2) agonists</a> and <a href="/facts/Alpha-2_adrenergic_receptor/QmUrvvYn">alpha-2 (α2) agonists</a>, which are used to treat <a href="/facts/High_blood_pressure/wlAvBfcf">high blood pressure</a> and <a href="/facts/Asthma/7GkJvxn3">asthma</a>, for example.
</p><p>Many <a href="/facts/List_of_distinct_cell_types_in_the_adult_human_body/IjWXx31l">cells</a> have these receptors, and the binding of a catecholamine to the receptor will generally stimulate the <a href="/facts/Sympathetic_nervous_system/hs8psNRd">sympathetic nervous system</a> (SNS). The SNS is responsible for the <a href="/facts/Fight-or-flight_response/hRrBawJP">fight-or-flight response</a>, which is triggered by experiences such as <a href="/facts/Exercise/egYQjt8A">exercise</a> or <a href="/facts/Fear/BSzreRdS">fear</a>-causing situations. This response <a href="/facts/Mydriasis/19r5uMvC">dilates pupils</a>, increases heart rate, mobilizes energy, and diverts blood flow from non-essential organs to <a href="/facts/Skeletal_muscle/en1tVYFN">skeletal muscle</a>. These effects together tend to increase physical performance momentarily.
</p>

Adrenergic receptor open-in-new

Adrenergic receptor