KINESIOL 3U03 Lecture Notes - Lecture 4: Internment Of Japanese Americans, Phosphocreatine, Vo2 Max
12 May 2016
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Gender differentiation: begins at fertilization; 6 weeks gestation primitive gonad can develop into female or male, 7 weeks if sry gene (sex-determining region of y chromosome) is active, results in differentiation to male (testes development) Will see testosterone/dihydro and mullerian suppression factor (can"t become a female at this point: if not active/absent primitive gonads differentiate into ovaries 13 weeks in fetal phase. Fetal occurs weeks 9 through 40: characterized by rapid growth in size and mass of the fetus; proportions will change and tissues (organs/systems) will begin to develop. Twins occurs 1 in 90 births: identical = monozygotic twins; 1/3 of 1 in 90, fraternal = dizygotic twins; 2/3 of 1 in 90. Congenital malformations (existing at birth: embryonic period is critical environmental factors can alter, interrupt/interfere with development, resulting in malformation, environmental agents affecting embryonic differentiation/specialization. Trauma, chemical/therapeutic drugs, radiation, infection, hypoxia, metabolic imbalance, maternal substance abuse.
