Pregnancy - Procreation Ø Conception Ø Pregnancy Ø...

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Unformatted text preview: Procreation Ø Conception Ø Pregnancy Ø Childbirth Conception Sperm Meets Egg : › The egg is released from the ovary into the body cavity. › The cervix secretes mucus that flushes the passageways to prepare for arrival of the sperm. › Sperm are capable of swimming about 1 inch per hour. Fallopian Tube Conception usually occurs in the outer third of the fallopian tube : › Zona Pellucida : Thin, gelatinous layer that surrounds the egg. › Hyaluronidase : Enzyme secreted by sperm that dissolves the zona pellucida, permitting one sperm to enter the egg. Following Conception › Zygote : Fertilized egg. About 36 hours after conception, it begins the process of cell division. For the first eight weeks of gestation the conceptus is called an embryo . From then until birth it is called a fetus . The nine-month pregnancy is divided into three equal trimesters . Improving the chances of conception Time intercourse so it occurs around the time of ovulation. › Keep a basal body temperature chart. Best to have intercourse about four times during the week in which the woman is to ovulate. Best position for conceiving is with the woman on her back. Lubricants and/or suppositories may kill sperm or block their entrance into the uterus. Development of the Conceptus During the first eight weeks the inner part of the ball of the cells implanted in the uterus differentiates into layers: › Ectoderm –Becomes the nervous system and the skin. › Endoderm- Becomes the digestive system and the respiratory system. › Mesoderm- Becomes muscles, skeleton, connective tissues, reproductive system, circulatory system. Support System for the Embryo The placenta is the mass of tissues that surrounds the conceptus early in development and nurtures its growth. › Human chorionic gonadotropin ( hCG ) is a hormone manufactured by the placenta. The umbilical cord is formed during the fifth week of embryonic development. Amniotic fluid maintains the fetus at a constant temperature and cushions it against possible injury. Development of the Fetus During the first trimester the small mass of cells implanted in the uterus develops into a fetus . 18th week : Fetal heartbeat can be detected as well as movement. 7th month : The fetus turns in the uterus to assume a head down position....
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This note was uploaded on 01/06/2012 for the course PSYCH 2306 taught by Professor Michaelrose during the Spring '11 term at Collins.

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Pregnancy - Procreation Ø Conception Ø Pregnancy Ø...

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