The rate and strength of beating of the heart is under the reciprocal control of the Adrenergic (sympathetic) and Cholinergic (parasympathetic) systems. Increased strength (inotropy) in cardiac beating in response to hormones like the blood-borne Epinephrine or to neurally delivered Norepinephrine is mediated by ADR-Beta (Beta-Adrenergic Receptors) , which are members of the superfamily of cell surface receptors that carry out signaling via coupling to G-proteins (Guanine nucleotide binding proteins)(Ref.1). ADR forms the int...
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