bio

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Author:
mmoreno28
ID:
40288
Filename:
bio
Updated:
2010-10-06 19:12:37
Tags:
cardiovascular
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Description:
bio
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  1. Funtions
    • Delivers Oxygen and nutrients to body organs
    • removes waste products of merabolism from tissue cells
  2. Major Components
    • circultory system
    • large and small elastic vessels
    • trnasports blood throughout body
    • Heart
    • hollow muscular organ
    • pumps blood thorughout body
  3. blood vessels
    • arteries
    • from heart to capillaries
    • usually oxygenated
    • aterioles = small ateries (.3 mm)
    • Veins
    • to heart from capillaries
    • usually deoxegenated
    • venules = small veins
  4. Capillaries
    • interchange of nutrients and celluar waste
    • typical count: 10 billion capilaries
    • total surface areas 500 square meters
    • most cells < 20 micorns from capillary
    • Capillary dimensions
    • walls .5 micron thick
    • diameter about 7-9 microns
    • precapillary shineters control flow
  5. heart
    • 2.6 billion heartbeats/lifetime
    • 70 bpm x 525,000 min/yr x 70 yr
    • 46 million gallons pumped in a lifetime
    • 1.25 g/min x 525, 00 min/yr x 70
    • size of two fists
    • 7-15 ounces
    • shaped like cone
  6. heart structure
    • myocardium
    • heart muscle
    • straited, involuntary
    • pericardium
    • sac around heart
    • chambers
    • atria(rt and lt)
    • ventricles
    • septum between
  7. heart valves
    • valves
    • atrioventricular valves
    • tricuspid, bicuspid(mitral)
    • chorade tendinae
    • connective tissue fibers
    • anchor valves to ventricle walls
    • semilunar valves
    • crescent shaped cusps(3)
    • seperate heart from circulatory system
    • pulmonic aortic
  8. heart vessels
    • veins
    • superior, inferior vena cava
    • pulmonary veins
    • arteries
    • aorta
    • pulmonary artery
  9. vascular pathways
    • pulmonary circuit
    • rt ventricle---> lungs---> left atrium
    • pulmonary artery, pulmonary veins
    • sytemic circuit
    • if ventricle--->body--> rt atrium
    • largest artery = aorta
    • largest viens = inferior, superior vena cava
  10. blood vloume %
    • large veins-39%
    • small veins, venules-25%
    • large arterties-8%
    • small arteries- 5%
    • capillaries, arterioles-7%
    • pulmonary vessels-9%
    • heart-7%
  11. blood flow
    • heart
    • most important in arterial flow
    • high pressure (120 mmhg)
    • muscle contraction
    • most important in venous flow
    • valves prevent back flow
    • respiration
    • helps venous flow
    • thoracic pressure falls
    • abdominal pressure rises

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