PSYC-2005EL Study Guide - Quiz Guide: Umbilical Cord, Amniotic Sac, Blastocyst
18 Dec 2018
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Document Summary
Chapter 3; prenatal development, birth, and the newborn. Prenatal development; the changes that transform a fertilized egg into a newborn human. Takes an average of 38 weeks, which are divided into three stages: period of the zygote. Begins with fertilization and ends when the fertilized egg (zygote) implants itself into the wall of the uterus. During these two weeks, the zygote grows rapidly through cell division and travels along the fallopian tube toward the uterus. Within hours the zygote divides for the first time; after that, division occurs every 12 hours. Sometimes the zygote will separate into two clusters developing twins. After about 4 days, the zygote comprises about 100 cells, resembles a hollow ball and is called a blastocyst. A small cluster of cells near the centre of the blastocyst; the germ disc , eventually develops into a baby; the other cells are destined to become structures that support, nourish, & protect the developing organism.
