what is growth
quantitative changes of an individual
changes in shape and tissue composition as well as distribution
cells divide and increase in number known as hyperplasia
cells increase in size known as hypertrophy
change from generalized cells to tissue to specialized tissue(differentiation)
development of conceptus
embryo ad fetus
embryo=fertilizaion- end of 8th week
organogenic period
fetus
first trimester = vulnerability stage of effects of drugs and radiation
organs develop
second trimester =complete development of an organ system
distinctively human features
third trimester= rapid fetal growth
organ systems become functional
factors regulating growth
1)Growth Hormone and insulin-like growth factors= protein synthesis and cell division
thyroid hormone = permissive role( permits other hormones to have an enhanced effect )that contributes to nervous system development
Insulin = supports tissue growth =stimulating protein synthesis
energy is provided in a form of glucose
2) adequate diet
3) absence of chronic stress
4) genetic potential