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Chapter 51

Section 3

TermDefinition
Gestation The time period of human development in the uterus
Blastocyst A ball of cells with a large, fluid filled cavity
Implantation The process in which the blastocyst burrows and embeds into the thickened lining
Pregnancy The nine-month period of gestation
Trimesters Pregnancy is divided into the three equal periods
Embryo The first eight weeks of pregnancy
Amniotic Sac Fluid-filled sac that surrounds the developing embryo
Chorionic Villi Small, finger like projections that extend into the uterine lining
Placenta The structure through which the mother nourishes the embryo
Umbilical Cord Contains the arteries and veins that carry blood between the embryo and the placenta
Human Chorionic Gonadotropin The developing placenta secretes a hormone early in the second week
Fetus From eight weeks until birth
Labor The muscular contractions and other events that lead-up to childbirth
Afterbirth The placenta, amnion, and uterine lining that are expelled after the baby is born
Created by: McLeanE18