The seminal vesicle is the accessory gland in human males whose secretion activates the sperms. The secretions of the seminal vesicles are alkaline, slimy and its PH is about 7.4. Prostate gland is a bilobed structure which surrounds the urethra close to its origin from the bladder. It pours an alkaline secretion into the semen as it passes through the urethra. Its secretions activate the sperms and prevent the semen from coagulating.
