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Biology Ch 51.3
Ch.51 vocab
| 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 | pregnancy is divided into three equal periods |
| 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 villus | fingerlike projections of the chorion that extend into the uterine lining (singular, chorionic villus) |
| 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 (abbreviation, HCG) |
| 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 |
Created by:
SchmidtE20
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