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14 Cards in this Set
- Front
- Back
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chondroblasts
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cartilage-forming cells that build a model of the future bone
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osteoblasts
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young bone-forming cells that cause the hard extracellular matrix of bone to develop
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osteocytes
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mature bone cells that maintain the structure of bone
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osteoclasts
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bone-dissolving cells
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components of bone
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protein collagen - flexibility
phosphorus, calcium - hardness, muscle contraction 1/3 is water |
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how many bones in the skull?
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8 in the cranium
14 in the face |
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what is the vertebral column divided into?
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cervical spine
thoracic spine lumbar spine sacrum coccyx |
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how many pairs of ribs?
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12 pairs (24 total)
10 joined to sternum bottom 2 are "floating" ribs |
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axial skeleton
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long axis of body:
skull vertebral column ribs 80 bones For protection |
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Appendicular skeleton
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upper and lower limbs
girdles that attach to limbs in axial skeleton 126 bones For movement |
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skeletal muscle
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voluntary
striated many nuclei attaches to bones via tendons |
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sarcomere
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contractile unit of muscle
made of protein filaments: actin and myosin |
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actin
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attaches to z-line
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myosin
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hangs between actin filaments
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