The female reproductive system is made up of many different parts, such as the female cell called the ovum or eggs. The ovum is the reproductive cell in females that can become a zygote after fertilization. (freedictionary.com) Located in the ovary, the egg is layered to protect the nucleus. The vitelline membrane is the plasma membrane that controls what goes in and out of the cell. A protein-based layer called the zona pellucida helps protect the egg. (educational-portal.com) The function is to carry a set of chromosomes from the female and initiate fertilization by the sperm. A problem with the egg is a ruined egg. That is, the inability to develop early embryonic death. The vagina is a flexible muscular tissue that is the sexual organ and is also known as the birth canal. Problems such as vaginitis caused by a yeast infection or bacterial overgrowth. (webmd.com) Sexually transmitted diseases such as gonorrhea or chlamydia are also infectious diseases transmitted through sexual intercourse. It has layers divided into four parts known as anterior, posterior and right lateral and left lateral. It connects the uterus to the external opening. The vagina extends from the cervix to the vulva. (webmd.com) The hymen is a thin layer of tissue that covers the external vaginal opening. The vagina is the pathway that allows menstrual blood or tissues to exit. Another function is for sexual activity and childbirth. (webmd.com) The lips are a structure of the female parts. There are two parts; labia majora which protect the external reproductive organs and the labia minora which can be thought of as the labia minora and surround the opening of the vagina and the urethra. (webmd.com) A problem can be vulvitis which is an inflammation of the vulva consisting of.. .... middle of paper ...... uterus. (Webmd.com) The menstrual cycle occurs due to the production of hormones. Ovarian tumors can occur. Some are germ cell tumors that can develop into cancer. Estrogen is a hormone produced by the ovaries. (webmd.com) This occurs mostly during the menstrual cycle and can later release the egg. It may work for fetal development and may help with the immune system. Hormonal imbalance may occur. (webmd.com) This means more estrogen and too little progesterone. This can be caused by excessive use of cosmetics or stress. (Wikipedia) Progesterone is a hormone produced by the ovaries during ovulation. It helps in preparing the uterus to receive an egg for fertilization. Menstruation will occur if the egg is not fertilized and progesterone levels decrease. High progesterone levels occur during pregnancy. (webmd.com)