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5 Written Questions

5 Matching Questions

  1. osteocyte
  2. repair of fractures 2/2
  3. stages of ossification
  4. Factors affecting bone growth (8)
  5. osteoblast
  1. a bone cell (mature bone cells)

    Maintains matrix
  2. b bone forming cell
    Builds matrix
  3. c 1. Deficiency of Vitamin A - retards bone development
    2. Deficiency of Vitamin C - results in fragile bones (collagen/fiber in connective tissue)
    3. Deficiency of Vitamin D - rickets, osteomalacia - softening of bones, vit D makes bones solid
    4. Insufficient Growth Hormone - dwarfism
    5. Excessive Growth Hormone - gigantism (beofre fusion), acromegaly (after bone fusion)
    6. Insufficient Thyroid Hormone - delays bone growth
    7. Sex Hormones - promote bone formation; stimulate ossification of epiphyseal plates
    8. Physical Stress - stimulates bone growth (b/c of remodeling)
  4. d cartilage gets blood flow from surface.
    ossified the ends - so you can walk
    ossified at shaft & cartilage is in between.

    (see slide #16)
  5. e 1. Normally 8 - 12 weeks (longer in elderly)
    2. Stages of healing
    a. Fracture hematoma - clot forms, then osteogenic cells form granulation tissue
    b. Soft callus
    i. Fibroblasts produce fibers and fibrocartilage
    c. Hard callus
    i. Osteoblasts produce a bony collar in 6 weeks
    d. Remodeling in 3 to 4 months
    i. spongy bone replaced by compact bone

5 Multiple Choice Questions

  1. around
  2. helps the bone not be so heavy. Line up the points of stress, not across.

    1. Sponge like appearance formed by plates of bone called trabeculae
    2. Trabeculae have few osteons or central canals
    - No osteocyte is far from blood of bone marrow
    3. Provides strength with little weight
    - Trabeculae develop along bone's lines of stress
  3. bone tissue can repair itself due to blood supply

    1. AKA Haversian systems
    2. Permit delivery of nutrients and removal of waste products
    3. Components
    a. Lamella - layers, rings, aka matrix
    b. Lacunae - dimples (osteon sits in lacunae)
    c. Canaliculi - like like little cracks, actually canals
    d. Central or Haversian canal - blood vessels, lymphatic vessels
    e. Volkmann's or Perforating canals - mainly blood vessels. connects central canals (ex. if one central canal gets clogged then get from here)
  4. to make RBCs
    1. Support (ex. to stand up)
    2. Protection (ex. cover vital organs)
    3. Movement - muscles covers - movement
    4. Mineral storage - calcium, 98% of calcium is stored in bone. (too much calc. in blood, then store in bones - like a bank, can add to bank until 30-35)
    5. Hematopoiesis (blood formation) - formation of blood cells, RBC, WBC, Platelets

    can't live w/o calc.
  5. 1. Cancellous (Spongy) Bone - inside bone
    2. Compact Bone - outside
    3. Long Bones - femur, tibia & humerous
    4. Short Bones - carpals, tarsals
    5. Flat Bones - skull, sternum
    6. Irregular Bones - pelvis

5 True/False Questions

  1. lacunaeinside

          

  2. central canals containblood vessels, lymphatic vessels

          

  3. sinusspecialized repair tissue that binds the broken ends of the fracture together.

          

  4. calcitonin secretionbone formation

          

  5. appositional growthgrowth in diameter

          

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