HSCI 120 Chapter Notes - Chapter 6: Amniotic Sac, Chorionic Villi, Umbilical Cord
16 May 2016
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Document Summary
Conception=fertilization of the egg by the sperm. First development necessary for conception is ovulation, which occurs on day 14 of a woman"s menstrual cycle. It is then picked up by the fimbriae and enters the fallopian tube, the goes to the uterus. Capacitation=removal of the plasma membrane overlying the sperm to allow for greater binding between the sperm and the egg. Best known sign of pregnancy=cessation of menstruation. Placenta=an organ that connects the fetus to the uterine wall for gas and nutrient exchange. Human chorionic gonadotropin (hcg) =a hormone produced by the chorionic villi of the placenta. The embryonic stage occurs following fertilization and lasts for the first 8 weeks of pregnancy. Placenta and amniotic sac develop during this stage. Amniotic sac=a sac, filled with amniotic fluid, that helps protect the embryo from outside damage and harmful temperature changes. First month of gestation=embryo starts to develop most of its major organs and organ systems.
