Smooth muscle along the trachea and the first few branches of bronchi have beta 2 adrenergic receptors.
气管和初级支气管分支的平滑肌上，都有β2受体。
Adrenergic receptors
原声例句
Osmosis-解剖与生理
Osmosis-解剖与生理
Going back to that turkey, when you're running, the sympathetic nerves stimulate those beta 2 adrenergic receptors and increase the diameter of the airways.
再来看逃离大鹅的例子：当我们在奔跑时，交感神经系统激动β2受体，使气道扩张，以吸入更多氧气。
医学英语 心内科
Class 2 beta blockers These drugs bind to beta-1 adrenergic receptors and block the sympathetic influences that act through these receptors.
第二类是β受体阻滞剂。这类药物与β-1肾上腺素能受体结合，阻断交感神经作用于这些受体产生的影响。
中文百科
肾上腺素受体 Adrenergic receptor
（重定向自Adrenergic receptors）
肾上腺素能受体（英语：Adrenergic receptors，或称为肾上腺素受体）是一类接受儿茶酚胺类物质刺激的代谢型G蛋白偶联受体，所接受的儿茶酚胺类主要是去甲肾上腺素以及肾上腺素。尽管多巴胺也属于儿茶酚胺类，但它的受体属于与此不同的另一类。
英语百科
Adrenergic receptor 肾上腺素受体
（重定向自Adrenergic receptors）
![The mechanism of adrenergic receptors. Adrenaline or noradrenaline are receptor ligands to either α1, α2 or β-adrenergic receptors. α1 couples to Gq, which results in increased intracellular Ca2+ and subsequent smooth muscle contraction. α2, on the other hand, couples to Gi, which causes a decrease in neurotransmitter release, as well as a decrease of cAMP activity resulting in smooth muscle contraction. β receptors couple to Gs, and increases intracellular cAMP activity, resulting in e.g. heart muscle contraction, smooth muscle relaxation and glycogenolysis.](/Images/godic/202412/20/Adrenoceptor-Signal_transduktion3829.PNG")
![Beta-2 adrenergic receptor (PDB: 2rh1), which stimulates cells to increase energy production and utilization. The membrane is shown schematically with a gray stripe.](/Images/godic/202412/20/lossy-page1-250px-100-AdrenergicReceptors-2rh1.tif3829.jpg")
The adrenergic receptors (or adrenoceptors) are a class of G protein-coupled receptors that are targets of the catecholamines, especially norepinephrine (noradrenaline) and epinephrine (adrenaline).
Many cells possess these receptors, and the binding of a catecholamine to the receptor will generally stimulate the sympathetic nervous system. The sympathetic nervous system is responsible for the fight-or-flight response, which includes widening the pupils of the eye, mobilizing energy, and diverting blood flow from non-essential organs to skeletal muscle.