participates in norepinephrine-epinephrine vasoconstriction involved in regulation of systemic arterial blood pressure smooth muscle contraction signal transduction phospholipase C-activating G protein-coupled receptor signaling pathway positive regulation of cytosolic calcium ion concentration negative regulation of cell population proliferation cell growth regulation of vasoconstriction positive regulation of MAPK cascade positive regulation of vasoconstriction positive regulation of ERK1 and ERK2 cascade alpha-1A adrenergic receptor Homo sapiens protein alpha-1A adrenergic receptor (human) hADRA1A ADRA1C PR:P35348 UniProtKB:P35348 alpha-adrenergic receptor 1c (human) ADRA1A DTO:02100027 An alpha-1A adrenergic receptor that is encoded in the genome of human. protein Reactome:R-HSA-390669 alpha-1C adrenergic receptor (human) alpha-1A adrenoceptor (human) alpha-1A adrenoreceptor (human) Category=organism-gene.