Summary: Bones 9/19

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  • 9.19 bones

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  • bones are remodeled throughout life in response to (2)

    calcium ion level in blood when bone matrix is made/broken
    pull of gravity and muscle on skeleton determines where bone matrix is made/broken
  • turnover/ frequency of bone remodeling due to calcium

    3 months
  • gravitational loading stress and pulling of muscles on skeleton (ie exercises) makes (2)

    dramatically thicker bone markings
    thicker bones
  • bones can act like a __ bank

    calcium
  • hormone in adults in calcium regulation feedback

    parathyroid hormone
  • hormone in children in calcium regulation feedback

    calcitonin
  • increase in size of the facial skeleton  happens after (2)

    tooth development
    enlargement of the respiratory passageways
  • size of skull in 2 year olds

    3/4 size of adult skull
  • size of skull at 8/9 years old

    nearly adult size in proportion
  • size of skull from ages 6 to 11

    face grows out from the skull
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