Enables alpha1-adrenergic receptor activity. Involved in multicellular organism aging; neuron-glial cell signaling; and regulation of blood pressure. Acts upstream of or within negative regulation of the force of heart contraction involved in baroreceptor response to increased systemic arterial blood pressure and norepinephrine-epinephrine vasoconstriction involved in regulation of systemic arterial blood pressure. Predicted to be located in cytosol. Predicted to be integral component of plasma membrane. Is expressed in brain; diencephalon; and forebrain. Orthologous to human ADRA1D (adrenoceptor alpha 1D). [provided by Alliance of Genome Resources, Apr 2022]