There are four main physiological functions of the prostate: 1. Exocrine function. The prostate gland is the largest accessory gland in men and is also one of the human exocrine glands. It can secrete prostatic fluid, an important component of semen, has an important role in the normal function of sperm, very important for fertility. The secretion of prostatic fluid is regulated by androgens. 2, endocrine function. The prostate is rich in 5α-reductase, which converts testosterone into the more physiologically active dihydrotestosterone. Dihydrotestosterone plays an important role in the pathogenesis of benign prostatic hyperplasia. By blocking the 5α-reductase enzyme, the production of dihydrotestosterone can be reduced, thus causing the hyperplastic prostate tissue to shrink. 3, control the function of urination. The prostate gland wraps around the urethra and is close to the bladder neck, constituting the proximal urethral wall, and its circular smooth muscle fibers surround the prostate part of the urethra and participate in constituting the internal urethral sphincter. When the urge to urinate occurs, accompanied by the contraction of the detrusor muscle, the internal sphincter is relaxed, so that urination proceeds smoothly. 4, transport function. The prostate gland has a urethra and two ejaculatory ducts that pass through it. When ejaculation occurs, the muscles of the prostate and seminal vesicle glands contract to press the contents of the vas deferens and seminal vesicle glands through the ejaculatory ducts into the posterior urethra and then out of the body.