Bones Part 1
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List the 6 functions of bones:
1- support 2- protection of soft organs 3- movement 4- mineral storage (Ca and P) 5- blood cell production: bone marrow 6- triglyceride storage: yellow marrow (adipose)
What type of marrow for babies and adults?
baby- red marrow adult- yellow marrow
What five ways are bones classified?
1- long 2- short 3- flat 4- irregular 5- sesamoid
Femur and Humerus are examples of:
long bones
Carpals and Tarsals are examples of:
short bones
Scapula and Sternum are examples of:
flat bones
Vertebrae is an example of:
irregular bone
Patella is an example of:
sesamoid bone
Which bone type is formed out of tendons?
sesamoid bones
What is the prefix for bone cells?
“osteo”
What are the 4 bone cells?
1- osteogenic 2- osteoblasts 3- osteocytes 4- osteoclasts
Osteogenic cells
• stem cells • only one to go through cell division -found in periosteum, endosteum, and canals that house blood vessels
Osteoblasts
• bone builders • secrete collagen fibers and extracellular matrix (Ca, P)
Osteocytes
• mature bone cells • maintain bone • bring in nutrients and excrete waste via plasma membrane
Osteoclast
• bone remodelers • lysosomes secrete digestive enzymes to destroy bone
Compact bone
• made of osteons • heavy
Spongy bone
• made of light weight • trabecular
Zone of resting cartilage
• provides a bridge between epiphysis and epiphysial plate • small chondrocytes
Zone of proliferating cartilage
• cell division (only zone) making chondrocytes
Zone of hypertrophic cartilage
• mature chondrocytes to maintain bone
Zone of calcified cartilage
• osteoclasts tear down cells • replaced with new bone cells
Intramembranous ossification
• forms flat bones skull, mandible, clavicle
Endochondral ossification
• all other bones of skeleton form this way • mesenchymal to cartilage to bone
Greenstick fracture
• seen in children • one side may fracture, other side bends