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HSCI 100 (38)
Chapter 18

Chapter 18 hsci 100 notes

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Health Sciences
HSCI 100
Nienkevan Houten

Chapter 18DEVELOPMENTTHROUGHOUTLIFEStagesofhumandevelopment1Preembryonic developmentndFertilization through the 2 week2Embryonic developmentWeek 383Fetal developmentFrom week 9 to birth 4Development after birth Postnatal includes all stages of life including infancy childhood etcMainprocessofdevelopmentCleavageCells undergo mitotic division 248 16 etc without the embryoin sizeGrowthCells undergo mitotic division as well asin sizeMorphogenesisThe embryo begins to take shape as cells migrateDifferentiationWhen cells take on specific structure and function the nervous system is the st1 visible system of the embryoPreembryonicdevelopmentweek11Ovulation2FertilizationSecretions from the female reproductive tract alter the surface of the plasma membrane of the spermThe sperm contacts the corona radiate and enzymes spill out of the acrosomeThe enzymes disrupt cellular attachment allowing passage of the sperm through the corona radiate and then the zona pellucida
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