sympathetic stimulation causes multiple choice mesangial cells to release angiotensin, which ultimately leads to granular cell relaxation. mesangial cells to release angiotensin, which ultimately leads to granular cell contraction. granular cells to release renin, which ultimately leads to mesangial cell contraction. inhibited release of erythropoietin and contraction of granular and mesangial cells. granular cells to release renin, which ultimately leads to mesangial cell relaxation.