BSIP, VERONIQUE ESTIOT / SCIENCE PHOTO LIBRARY BSIP, VERONIQUE ESTIOT / SCIENCE PHOTO LIBRARY
Male reproductive system. Artwork of a cross- section of the male reproductive system, seen from the side. Sperm are produced in the testis (red, lower centre). During ejaculation the sperm pass out of the two testes into the vas deferens tube (yellow). They are then mixed with fluids from the seminal vesicle (yellow, far right) and the prostate gland (dark yellow, centre right). The resulting mixture, known as semen, passes out of the body through the urethra (red, lower left) in the penis. Erectile tissue (pale yellow) in the penis fills with blood to hold it erect. Also seen is the urinary bladder (red, upper right).
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