First, the testes (the male sex organ) produces sperm and stores it in the epididymis. Next, the sperm travels through a tube called the vas deferens until it gets to the seminal vesicles. Then, these seminal vesicles provide energy for the sperm (making them active) by adding a fluid. After the vesicles add this fluid, the bulbourethral glands add another fluid, which will protect the sperm when it enters the urethra (which is rather acidic). After these glands add this second fluid, the prostate glands add a third fluid to further protect the sperm. This liquid, called semen, is then forced through the urethra when the muscles at the base of the bladder contract. The semen is thus ejaculated into the vagina, where it travels through the cervix and into the uterus. There, the sperm will meet the oocyte in the fallopian tube, or oviduct. Once the sperm and egg meet, acrosome will release an enzyme to disintegrate the outer layer of the egg's membrane. This cell membrane will then change its electrical characteristics, resulting in a cortical reaction. Finally, the chromosomes from both the male and the female will come together in a process called meiosis, which will restore the initial diploid number of the chromosomes.
