HLTC23H3 Lecture Notes - Weaning, Birth Weight, Sex Steroid
Document Summary
Lecture 2 patterns of human growth january 16, 2012. Hyperplasia: new cell growth (division) by mitosis. Hypertrophy: enlargement (growth) of already existing cells. Juvenile: adolescence, reproductive adulthood, old age and senescence, period of greatest cell production (multiplication of millions of cells and differentiation of cells into hundreds of different body parts) Second trimester: completion of cell differentiation into tissues and organs, embryo now a fetus. See increase in rate of growth of length. Third trimester: growth rate in weight increases. See development and maturation of circulatory, respiratory, digestive systems. Prenatal life: especially during first trimester (greatest metabolic activity/ cell growth) is a period of high susceptibility to growth pathology caused by either. Exposure to harmful environmental agents that disrupt normal course of development. Importance of maternal nutrition and lifestyle: postnatal life. From reliance on mom"s oxygen and nutrients to self-reliance for digestion, respiration, and waste elimination. Nearly of all neonatal deaths occur during first 24 hours.
