Circulatory System

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Circulatory System
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Blood vessels

• Arteries, capillaries, veins are tube-like in
  construction
• They transport blood to and from the heart and
  then to various body tissues

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Blood vessels

• Arteries
• Thick-walled muscular and elastic tubes that
  carry oxygenated blood from heart to capillaries
• Largest artery is the aorta

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Blood vessels

• Capillaries
• Minute, thin-walled vessels that connect smaller
  arteries to veins
• Provide tissues with nourishment and elimination
  of waste products

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Blood vessels

• Veins
• Thin-walled blood vessels
• Less elastic than arteries
• Contain cup-like valves to prevent back flow, and
  carry blood containing waste products from
  capillaries back to heart
• Located closer to outer surface off body than
  arteries

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The Blood

• Nutritive fluid circulating through the
  circulatory system
• Approximately 80 water
• Composed of red and white corpuscles, platelets,
  plasma and hemoglobin

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The Blood

• Sticky, salty fluid
• Normal temperature of 98.6 degrees F
• Makes up 1/20 of body weight
• About 8-10 pints fill adult vessels
• Bright red in arteries
• Dark red in veins (except pulmonary)

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Blood Composition

• Red Corpuscles (red blood cells)
• Also known as erythrocytes
• Produced in red bone marrow
• Contain hemoglobin (a complex iron protein that
  gives the blood its bright red color)
• Carry oxygen to cells

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Blood Composition

• White Corpuscles (white blood cells)
• Also called leucocytes
• Destroy disease-causing germs
• Blood Platelets
• Smaller than red blood cells
• Important to clotting
• Plasma
• Fluid part of the blood
• Straw-like in color
• About 90 water and contains proteins, sugar and
  oxygen
• Carries food and secretions to cells and carbon
  dioxide from cells

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Chief functions of Blood

• Carries water, oxygen, food, secretions to cells
• Carries away carbon dioxide and waste
• To be eliminated through lungs, skin, kidneys and
  large intestine
• Helps equalize body temperature
• Protects from harmful bacteria and infections
• Through white blood cells
• Clotting
• Which closes injured minute blood vessels and
  prevents excessive blood loss

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