Prostate, as the largest accessory gonadal organ in men, has many physiological functions. Anatomically, the prostate constitutes the wall of the proximal urethra, including the internal urethral sphincter, which surrounds the prostatic urethra with circular smooth muscle fibers, controls the discharge of urine from the bladder, and helps the semen that has entered the seminal vesicle and prostate to be discharged through the urethra during ejaculation.
The prostate has an exocrine function and can secrete about 0.5-2.0 ml of thin milky white prostatic fluid every day. Prostatic fluid is an important component of semen, accounting for about 25% -33% of the total semen. It contains fructose, amino acids, lecithin and so on, which are the main energy sources for sperm motility. A large number of potassium citrate, phosphoric acid, sodium, potassium, calcium and other substances in prostatic fluid can alkalize semen to alleviate the acidic environment in the vagina of women and improve the survival rate and activity of sperm. The prostatic fluid secretes a large amount of semen liquefying enzyme to help the coagulated semen liquefy; Prostatic fluid contains hyaluronidase, which can help sperm entering the vagina penetrate cervical mucus and the ventral membrane of the egg, and promote the combination of sperm and egg.
The prostate gland also has a certain endocrine function, which can quickly metabolize testosterone into male hormones with stronger vitality and transport them into the blood. The prostate also regulates hypothalamic and pituitary functions to some extent.