The Vagina
The vagina is a muscular, hollow tube that extends from the vaginal opening to the uterus. Because it has muscular walls, it can expand and contract. This ability to become wider or narrower allows the vagina to contain something as slim as a tampon and as wide as a baby. The vagina's muscular walls are lined with mucous membranes, which keep it protected and moist. The female reproductive system is designed to carry out several functions. It produces the female egg cells necessary for reproduction, called the ova or oocytes. The system is designed to transport the ova to the site of fertilization. Conception, the fertilization of an egg by a sperm, normally occurs in the fallopian tubes. The next step for the fertilized egg is to implant into the walls of the uterus, beginning the initial stages of pregnancy. If fertilization and/or implantation does not take place, the system is designed to menstruate (the monthly shedding of the uterine lining). Also, the female reproductive system produces female sex hormones that maintain the reproductive cycle.The Penis
The penis is the most visible part of the male reproductive system. It is
primarily used for penetration during the act of sexual intercourse. The penis
has three parts; namely, the base, the shaft and the head. The base is the lower
part of the penis while the shaft is the cylindrical part of the organ. The
head, also known as the glans, is the most sensitive part of the penis. It is
also the part where urine and semen comes out. The penis has many blood vessels
that fill with blood prior to intercourse. This makes the organ rigid enough for
penetration. Ejaculation usually occurs when the penis is inside the vagina,
allowing the sperm cells in the semen a means of getting into the female
reproductive system for fertilization.
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