Arteries, veins, and capillaries transport blood to all parts of the body.

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Arteries, veins, and capillaries transport blood
to all parts of the body.
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• Arteries carry blood away from the heart.
• blood under great pressure
• thicker, more muscular walls

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• Veins carry blood back to the heart.

• blood under less pressure
• thinner walls, larger diameter
• valves prevent backflow

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• Capillaries move blood between veins, arteries,
  and cells.

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• Blood Components
• plasma
• red blood cells
• white blood cells
• platelets

Blood transports materials
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• Plasma

• 55 of Blood
• molecules diffuse into and out of it
• contains proteins and clotting factors
• 90 water

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• Red blood cells

• transport oxygen to cells and carry away carbon
  dioxide
• have no nuclei and contain hemoglobin

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• White Blood Cells
• fight pathogens and destroy foreign matter.

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• Platelets
• help form clots that control bleeding.