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        | groove in a bone with a tubular structure |  | 
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        | roughly, circular opening |  | 
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        | shallow cup like deppression |  | 
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        | the junction of epiphysis to the shaft |  | 
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        | red & white blood cells are produced in which bone type |  | Definition 
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        | cortical (compact) bone make up how much of our skeleton |  | Definition 
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        | trabecular (spongy) bone make up how much of our skeleton |  | Definition 
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        | bone cells that are able to produce new substance |  | 
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        | bone cells that break down bone |  | 
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        | function of immune system |  | Definition 
 
        | protection  from infection |  | 
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        | function of lymphatic system |  | Definition 
 
        | return of interstitial fluid, absorption of digested fat |  | 
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        | feature of large lymphatic vessels |  | Definition 
 
        | have one way valves to prevent leakage |  | 
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        | thoracic duct & right lymphatic duct |  | Definition 
 
        | 2 of largest vessels, empty into large vessels & veins of heart |  | 
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        | receives lymph from the left side of the body superior to the diaphram and from both sides inferior to the diaphram |  | 
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        | receives lymph from the right side of the body superior to the diaphram |  | 
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        | thymus (location & function) |  | Definition 
 
        | -lies posterior to the manubrium. -helps mature lymphocytes.
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        | contains no red blood cells, some white blood cells |  | 
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        | Spleen (location & structure) |  | Definition 
 
        | -located under the 9 and 11 rib -white and red pulp
 white pulp forms lymphoid nodules, red pulp screens & removes red blood cells
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        | lymphocytes, becomes a plasmacyte, produces antibodies, targets antigens |  | 
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        | Cytotoxic, natural killer cells attack foreign and body cells infected by viruses |  | 
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        | end of canal or tunnel opening of canal |  | 
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