1 / 14

The Reproductive System

Reproduction. A life process necessary for the survival of a species, but not an individual

chyna
Download Presentation

The Reproductive System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    1. Chapter 39 The Reproductive System

    2. Reproduction A life process necessary for the survival of a species, but not an individual…

    3. The Male Reproductive System The testes produce the male sex cell sperm through the process of meiosis. Sperm are haploid (23 chromosomes). The testes also produce the hormone testosterone. Testosterone aids in sperm production and is responsible for the development of secondary sex characteristics.

    4. The Male Reproductive System

    5. The Female Reproductive System The ovaries produce the female sex cell eggs through the process of meiosis. Eggs are haploid (23 chromosomes). The ovaries also produce the hormones estrogen and progesterone. Estrogen aids in egg development and is responsible for the formation of secondary sex characteristics. Progesterone prepares the uterus for implantation by a fertilized egg.

    6. The Female Reproductive System

    7. The Menstrual Cycle Beginning with puberty, the female reproductive system begins a periodic cycle of events regulated by hormones from the pituitary and ovaries. This is known as the menstrual cycle. This cycle prepares the uterus each month for the advent of pregnancy, when a fertilized egg will implant itself in the uterine wall. If this does not occur, the uterine lining is shed out the vagina. This is called menstruation.

    8. The Menstrual Cycle

    9. Fertilization and Development Fertilization occurs in the Fallopian tube (oviduct). A sperm unites with the egg to produce a diploid zygote (46 chromosomes). The zygote undergoes a series of mitotic cell divisions without growth in size (cleavage) on its way to the uterus. Approximately 7 days later the hollow ball of cells (blastocyst) implants itself in the uterine wall.

    10. Fertilization and Implantation

    11. Development After implantation the cells begin to differentiate. Tissue from both the mother and embryo form the placenta – a temporary organ that will nourish the developing baby. Throughout the next nine months the developing baby obtains nutrients and gets rid of wastes through its connection to the placenta, the umbilical cord. Nutrients and wastes pass between the blood of the mother and baby by diffusion.

    12. The Placenta

    13. Birth At the end of nine months hormone changes produce a series of contractions in the uterus known as labor. The protective membrane surrounding the baby (amnion) ruptures releasing fluid (“water breaks”). Birth is imminent. Contractions stretch the cervix to a diameter of about 10 cm and the baby is delivered head first (usually). Contractions close off the umbilical cord near the baby. The cord is cut, and eventually falls off leaving a scar (belly button). Soon after, a second series of contractions force the placenta out of the womb (after birth).

More Related