Vein valves and varicose veins

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Vein valves and varicose veins
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• Pressure in veins is very low

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• Pressure in veins is very low
• Problem how get blood all the way from toes
  back to heart?

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• Spider veins are usually in capillaries (not
  veins)
• Much smaller
• May appear red, purple, or blue
• Usually dont indicate any problem
• If new ones come up frequently mention to your
  doctor

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• Valves usually prevent backflow
• Muscular action squeezes blood back to the heart

• Leaky valves allow blood to flow back down
• Prolonged standing
• Pregnancy
• Lack of exercise
• Age
• Strenuous muscular work can cause some
• obesity
• Blood forms pool in veins
• Can lead to clots
• Clots can break off and spread through body
• These clots can cause heart attack or stroke

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• When breathing, diaphragm moves up and down
• Diaphragm squeezes blood in vena cava up to right
  atrium

exhale
Work harder
inhale
Breathe faster
More blood returned to heart