PSYB20H3 Chapter Notes - Chapter 3: Aids, New Idea, Morning Sickness
1 May 2017
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1: ovulation the ovary releases an egg cell into the fallopian tube. 3: during day 1 the egg divivdes into two cells. 4: by day 4 the egg becomes a morula a solid ball of cells. 5: one day 5 the blastocyst a hollow ball of cells hatcges from the coat that surrounded the egg. 6: by day 7 implantation is under way. 7: on day 9 the zygote consist of two cell layers and the chorian has begun to form. 8: on day 16 gastrulation is occursing producing 3 cell layers, ectoderm, which forms skin and nervous system mesoderm: becomes the muscle, blood and bone, and endoderm: which forms the lungs and digestive tract. 9: on day 21 the neural tube is forming. 10: day 25 the yolk sac will become incorporated into umbilical cord. 11: on day 36: the embryo is fish like with yes, gill like arches, a large heart, paddle shaped limbs and tail.
