Effects of Tiangou Jiangya capsule on blood pressure in spontaneous hypertensive rat Effect of Jimaitong tablt combined with nifedipine on blood-pressure andmechanisms investigation in spontaneously hypertensive rats Effect of Astragalus Membranaceus on Baroreflex Sensitivity in Spontaneously Hypertensive Rats Antihypertensive effect and vascular regulation mechanism of rhynchophylline on spontaneously hypertensive rats