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Vocab 51.3

Gestation

TermDefinition
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 off the uterus
Pregnancy The period of time between implantation and birth
Trimester One of the three equal periods of about 12 weeks into which the human gestation period is divided
Embryo An organism in an early stage of development of plants and animals; 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 Gonadotropic A hormone that is secreted by the placenta and that stimulates ovulation and secretion of progesterone or testosterone
Fetus A developing human during the period from the eight week 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 the birth
Created by: GutzwillerL19
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