![]() ![]() The prostate needs androgens, which are male sex hormones, such as testosterone, to function correctly. This is why, in typical anatomic situations, it is impossible to urinate and ejaculate simultaneously. ![]() When the prostate contracts during ejaculation, it closes off the opening between the bladder and urethra, pushing semen through at speed. Here, it mixes with sperm cells and fluid from the seminal vesicles to create semen, which the body then expels. Closing the urethra during ejaculationĭuring ejaculation, the prostate contracts and squirts prostatic fluid into the urethra. This is to counteract the acidity of the vagina and protect the sperm from damage. Prostatic fluid is slightly acidic, but other components of semen make it alkaline overall. The fluid in semen helps the sperm travel down the urethra and survive the journey towards an egg, which is essential for reproduction. One important enzyme is prostate-specific antigen (PSA), which helps make the semen thinner and more fluid. Prostatic fluid contains components that make semen an ideal substance for sperm cells to live in, including enzymes, zinc, and citric acid. ![]() The remainder comes from the seminal vesicles (50–65%) and the testicles (5%). The prostate contributes 20–30% of fluid to the total semen volume. The primary function of the prostate is to contribute prostatic fluid to semen. The following sections discuss the functions of the prostate. A person does not require a functioning prostate to live, but it is important for fertility. ![]()
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