Kinesiology 3347A/B Lecture Notes - Prenatal Development, Lunar Month, Gestational Age
10 Nov 2012
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Unit 3: prenatal growth: tends to follow chronological timelines much more strictly than postnatal growth far more predictable. Cell theory: all living things are composed of cells, the cell is the basic functional, structural and organizational unit of life, cells only arise from pre-existing cells, cells carry genetic info in the form of dna. Growth rate = 2/25 = 0. 08g/day: blue whale. 259-294 day gestation (266 days on average) 37-42 weeks. Most of the mass that a human fetus accumulates is from the 4th month of pregnancy onward. In utero growth and development requires 266 days: conceptional/ fertilizational age, menstrual/gestational age (relative to last menstruation of mother, 280 days) - 10 lunar months, lunar month = 4 weeks (28 days per month, approximate dob: Beginning of last menstruation (b/c difficult to determine exactly when conception happened early on) Add 7 days: 95% of babies born +/- 2 weeks (of this predicted dob, weight increases several billion fold (as embryo develops)
