Chapter 7 Flashcards
Epiphyseal Line
Remnant of where growth occurred
Epiphyseal Plate
Site of active growth
Endochondral Ossification
Process by which long bones grow
Hypercalcemia
Too much blood in calcium
Hypocalcemia
Too little calcium in blood
5 functions of Bone
Support
Protection
Movement
Calcium balance ( homeostasis)
Blood formation ( blood cell synthesis)
What does “ Oss” mean
Bone
What are the names of hard bone?
Hard
Cortical
Lamellar
Dense
Diaphysis
Shaft of a long bone
Epiphysis
Widened end of long bone
Articulation
Joint
Periosteum
Outer
Endosteum
Inner
Spongy bone
Offers strength without adding much mass
4 cells for Bone:
- Osteogenic - stem cell
- Osteoblast- bone builder ( deposit calcium into bone)
- Osteocyte- bony room ( lacuna)
- Osteoclast- born in bone marrow, moved to hard bone. Breaks down bone. Takes calcium out of bone and put it into blood
What is Calcitonin & what does it do?
It is secreted by the thyroid gland
Lowers blood calcium
Turns on deposition ( stimulates osteoblasts)
Turns off resorption ( osteoclasts)
Calcitriol ( Vitamin D)
Skin, liver and kidneys activate it into a hormone
Correct hypocalcemia through resorption, reabsorption, absorption
Parathyroid hormone
4 small glands on the back of the neck
Correct hypocalcemia
Turns on resorption, reabsorption, vitamin D synthesis
Turns off deposition ( inhibits osteoblasts)
Stimulated resorption
