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14 Cards in this Set

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chondroblasts
cartilage-forming cells that build a model of the future bone
osteoblasts
young bone-forming cells that cause the hard extracellular matrix of bone to develop
osteocytes
mature bone cells that maintain the structure of bone
osteoclasts
bone-dissolving cells
components of bone
protein collagen - flexibility
phosphorus, calcium - hardness, muscle contraction
1/3 is water
how many bones in the skull?
8 in the cranium
14 in the face
what is the vertebral column divided into?
cervical spine
thoracic spine
lumbar spine
sacrum
coccyx
how many pairs of ribs?
12 pairs (24 total)
10 joined to sternum
bottom 2 are "floating" ribs
axial skeleton
long axis of body:
skull
vertebral column
ribs
80 bones

For protection
Appendicular skeleton
upper and lower limbs
girdles that attach to limbs in axial skeleton
126 bones

For movement
skeletal muscle
voluntary
striated
many nuclei
attaches to bones via tendons
sarcomere
contractile unit of muscle
made of protein filaments: actin and myosin
actin
attaches to z-line
myosin
hangs between actin filaments