Enables alpha1-adrenergic receptor activity. Involved in multicellular organism aging; neuron-glial cell signaling; and regulation of blood pressure. Acts upstream of or within several processes, including positive regulation of blood pressure; regulation of glycogen catabolic process; and response to alkaloid. Is integral component of membrane. Is expressed in central nervous system; heart; retina; and testis. Orthologous to human ADRA1B (adrenoceptor alpha 1B). [provided by Alliance of Genome Resources, Apr 2022]