Adrenoceptors are proteins that recognize neurotransmitters norepinephrine and epinephrine. They are divided into alpha and beta-adrenergic receptors, which activate secondary messengers and ion channels. Alpha1-adrenoceptors activate neurons, while alpha2-adrenoceptors reduce neurotransmitter release. Beta1-adrenoceptors increase heart rate and contraction, while beta2-adrenoceptors relax smooth muscles. An adrenergic receptor may also be called an adrenergic receptor and is […]