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37 Cards in this Set

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  • Back
What do the vertibrae protect?
spinal chord
Where are blood cells produced?
bone marrow
Where is extra Calcium stored?
bones
What is the skeletal system composed of?
bone and cartilage
Bone
hard, strong, mineralized tissue containing both organic and inorganic components
What are hydroxyapatitecrystals composed of?
Calcium, Phosphate, Hydroxide
What are the two types of bone?
compact bone and spongy bone
Compact bone
forms on the exterior of most bones and is hard and dense
Spongy bone
less dense than compact bone consisting of interconnecting lattice of bony spicules within long bones
What is cartilage made of?
chondrin
What do chondrocytes secrete?
chondrin
What is the embryonic skeleton mostly made of?
cartilage
Long bones grow by what process?
endochondral ossification

(cartilage template grows and is replaced by bone)
Skull is formed by what method?
intramembranous ossification

(bone is formed directly from undifferentiated cells without a pre-existing cartilage template)
The skeleton can be divided into what 2 sections?
axial skeleton and appendicular skeleton
What does the axial skeleton exist of?
skull, vertibral column, and rib cage
What does the appendicular skeleton exist of?
arm and leg bones, pectoral and pelvic girdles
Epiphysis
rounded ends of long bones
Diaphysis
cylindrical inner of long bones
What does the epiphysial plate separate in long, growing bones?
Epiphysis and Diaphysis
What do you call the tough, outer covering of bones?
periosteum
What does the periosteum contain?
blood vessels and bundles of collagenous fibers
What does an osteon contain?
Haversion canal and surrounding lamellae
Where are Haversion canals found?
compact bone
What do Haversion canals contain?
blood and lymph vessels, nerves, connective fibers
What do you call the concentric layers of bony matrix found around the Haversion canals?
lamellae
Osteocytes
bone cells
Lacunae house what?
osteocytes
Lacunae are linked to Haversion canals via what?
canaliculi
What does yellow marrow store?
fat
What does red marrow store?
contains stem cells which form blood and immune cells
Bone remodeling
processes of bone formation and bone resorption
What are two main inorganic components that are drawn out of the blood when during bone formation?
Calcium and phosphate
Parathyroid hormone raises or lowers plasma Ca levels?
raises

(by stimulating Ca release from bones)
Calcitonin raises or lowers plasma Ca levels?
lowers
Osteoblasts
make bone
Osteoclasts
reabsorb bone