Varicose veins enlarged veins that are swollen and raised due to blood pooling in veins

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Varicose veins enlarged veins that are swollen and raised due to blood pooling in veins Powered By Docstoc
					• Varicose veins: enlarged
  veins that are swollen
  and raised due to blood
  pooling in veins

• Hemorrhoids
  – Varicose veins of anus
  –
     Systemic circulation
• Arteries smaller and smaller arteries 
  arterioles  capillary beds  venules 
  veins  larger veins  heart
• Arteries: carry blood away from heart,
  walls are strong and stretchy to propel
  blood (expressways and roads away from heart)
• Veins: carry blood to the heart, low blood
  pressure, often flow against gravity, have
  valves; thin walls (expressways and roads TO the
  heart)
• Capillaries: walls are VERY thin = easy
  exchange b/w blood and tissue; thick
  enough for RBCs to go single-file (back alleys
  and drive ways)
Major Arteries

         • Aorta: arches left
           (aortic arch) then
           plunges down
           (thoracic aorta),
           passes through
           diaphragm
           (abdominal aorta)
Other major arteries to know…
               •   Carotid
               •   Axillary
               •   Brachial
               •   Radial
               •   Ulnar
               •   Femoral
             Capillaries

• Substances move down concentration
  gradients
• Capillary walls are 1 cell thick
Veins




        • All empty into
          superior/inferior vena
          cava
Other major veins to know…
             • Jugular
             • Brachial
             • Femoral

				
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