Growth review
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true growth
increase in BW until mature size is reached
what don’t we know about growth
why it starts, how it’s regulated, how it stops
hyperplasia
increase in cell numbers
hypertrophy
increase in cell size
endoderm
GI tract, lungs, bladder
Mesoderm
skeleton, skeletal muscle, C.T
ectoderm
skin, hair, brain, spinal cord
tissues
specialized group of cells that function together
organs
groups of tissues that work together to perform specific functions
system
a group of organs that accomplishes a larger function
two parts to long bones
• epiphyses (enlarged ends) • diaphysis (shaft region)
osteoblasts
bone matrix production
osteocytes
maintenance of bone matrix
osteogenesis
formation of bone
osteoclasts
involved in bone resorption (breakdown and remodeling)
what does cartilage determine
maturity
2 factors of frame size
-height at hips -age
fat development is by
hypertrophy
shape of the growth curve
sigmoidal (S-shaped)
What hormone’s responsible for increasing rate of the closure of the epiphyseal plate to slow growth?
estrogen
this hormone stimulates muscle development and has an inhibitory influence on fat deposition
testosterone
4 locations of fat deposition
-KPH -intermuscular -intramuscular -subcuntaneous
are intact males usually leaner than their castrated and female counterparts
yes