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MB 51.3
MB Chapter 51, Section 3
Term | Definition |
---|---|
gestation | in mammals, the process of carrying young from fertilization to birth |
blastocyst | the modified blastula stage of mammalian embryos |
implantation | the process by which the newly fertilized egg in the blastocyst stage embeds itself in the lining of the uterus |
pregnancy | the period of time between conception and birth |
trimester | the three equal periods in which the pregnancy is divided |
embryo | in humans, a developing individual is referred to as an embryo from the second through the eighth week of pregnancy |
amniotic sac | the sac formed by the amnion |
chorionic villi | fingerlike projections of the chorion that extend into the uterine lining |
placenta | the structure that attaches a developing fetus to the uterus and that enables the exchange of nutrients, wastes, and gases between the mother and the fetus |
umbilical cord | the structure that connects an embryo and then the fetus to the placenta and through which blood vessels pass |
human chorionic gonadotropin | a hormone that is secreted by the placenta and that stimulates ovulation and secretion of progesterone or testosterone |
fetus | a developing human from seven or eight weeks after fertilization until birth |
labor | the process by which the fetus and the placenta come out of the uterus |
afterbirth | the remains of the placenta and the membranes, which are expelled from the mother's body following birth |