PA2 catalyzes the calcium-dependent hydrolysis of the 2-acyl groups in 3-sn-phosphoglycerides. Induces insulin secretion in isolated rat islets under high glucose concentration conditions, but not under low glucose concentration conditions. Increases perfusion pressure, renal vascular resistance, urinary flow, glomerular filtration rate, and potassium, sodium, and chloride excretion levels in rat kidney. Does not increase perfusion pressure in the rat mesenteric vascular bed. a 1,2-diacyl-sn-glycero-3-phosphocholine + H2O = a 1-acyl-sn-glycero-3-phosphocholine + a fatty acid + H(+) Binds 1 Ca(2+) ion per subunit. Inhibited by morin and p-BPB. Expressed uniformly in tentacles (at protein level). Belongs to the phospholipase A2 family.