remodeling of skeletal structures bone tissue is constantly being torn down and built up about 10%...
TRANSCRIPT
Remodelingof skeletal structures
Bone tissue is constantlybeing torn down
and built up
About 10% of bone is replaced every year in an adult skeleton
boneformation
bonereabsorption
osteoblasts osteoclasts
boneformation
bonereabsorption
osteoblasts osteoclastsCalcitonin (CT)
from thyroidParathyroidhormone (PTH)
from parathyroid
Hormonal effects
bone
formation
bone
reabsorption
osteoblasts osteoclasts
Age effects
Before age 25
boneformation
bonereabsorption
osteoblasts osteoclasts
Age effects
Age 25-50
boneformation
bonereabsorption
osteoblasts osteoclasts
Age effects
Age 50-120
bone
formation
bone
reabsorption
osteoblasts osteoclasts
Stress effects
Stress increases bone density
Direction of stresscan alter orientation
& size ofof osteons
Increasingbone stress can
reduce or eliminateage-related bone loss
Space traveldecreases stress
& increases bone loss
Too much stress . . .