The Reproductive System Part 2 Chapter 39 Section 3.
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Transcript of The Reproductive System Part 2 Chapter 39 Section 3.
This artificially colored scanning electron micrograph shows sperm (orange objects) on the uterine wall.
The Female Reproductive System
• The main function of the female reproductive system is to produce ova. In addition, the female reproductive system prepares the female's body to nourish a developing embryo.
• the ovaries usually produce only one mature ovum (plural: ova), or egg, each month.
The Menstrual Cycle
• The interaction of the reproductive system and the endocrine system in females takes the form of a complex series of periodic events called the menstrual cycle
• The cycle takes an average of about 28 days. (about a month, test question)
• During the menstrual cycle, an egg develops and is released from an ovary.
• In addition, the uterus is prepared to receive a fertilized egg.
• If the egg is fertilized, it is implanted in the uterus and embryonic development begins.
• If an egg is not fertilized, it is discharged, along with the lining of the uterus.
The process by which a sperm joins an egg is called fertilization.Once the sperm nucleus enters the egg, the egg's cell membrane changes, preventing other sperm from entering.
Gastrulation
• takes place in the uterus. (test question)
• The result of gastrulation is the formation of three cell layers: ectoderm, mesoderm, and endoderm. (test question)
• all of the organs and tissues of the embryo will be formed from these germ layers.
• The ectoderm will develop into the skin and the nervous system.
• The endoderm forms the lining of the digestive system and many of the digestive organs.
• Mesoderm cells differentiate to form many of the body's internal tissues and organs.