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        | Transport Gases, adjust pressure, dissipate heat, carry nutrients, transport hormones, transport waste, assist in immunity and defense.   Cardiovascular/Lymphatic |  | 
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        | Lymph transport, prevents edema, fights infection. |  | 
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        | Ventral veins, first to form from the mesenchyme around the yolk sac. |  | 
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        | Sinus Venosus, Atrium, Ventricle, Bulbus Cordis |  | 
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        | RBC (erythrocytes), WBC (leukocytes), platelets (thrombocytes) and plasma (55%).   Connective tissue. |  | 
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        | 92% H2O, 8% Ions, salts, organic compounds. |  | 
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 | Definition 
 
        | contain hemoglobin to carry O2. Have nuclei (except mammals).Live 3-4 mos.
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        | Defend against infection. |  | 
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        | Responsible for clotting. |  | 
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 | Definition 
 
        | Thickest. Take blood away from the heart. Oxygenated (except for the pulmonary artery) |  | 
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        | Thinnest. Material exchange in blood. |  | 
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        | Carry blood to the heart. Typically deoxygenated (except pulmonary vein). |  | 
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        | Highest in arteries. Systole: Contraction Diastole: Relaxed |  | 
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        | Term 
 | Definition 
 
        | Both have: 3 layered walls Smooth muscle   Arteries have: large amounts of elastic fibers. Systole and Diastole pressure.   Veins have: Internal valves to ensure one way flow. |  | 
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        | Term 
 | Definition 
 
        | Smooth muscle that adjusts flow to match activity so that blood gets to active organs. |  | 
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 | Definition 
 
        | Blood goes through the heart once per circuit. Fish. |  | 
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        | Blood goes through heart twice per circuit. Extra pulmonary circuit. Tetrapods. |  | 
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