What is the use of adrenergic receptor, Biology

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Q. What is the use of Adrenergic Receptor?

Adrenergic Receptors are also subdivided into 2 major categories: ALPHA α - or- BETA β


In general, when NE (E) binds to alpha receptors -> excitatory

beta receptors -> inhibitory (with notable exceptions: heart β1)

Beta-1 receptors are found on heart -> NE (E) stimulates HR and SV
Beta-2 receptors are found on lungs and some viscera -> (-) NE serves to dilate airways and slow down GI tract activity. Note that non-specific  β (1,2) blockers decrease HR and BP, but can also constrict airways (undesirable effects). 


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