Part II: Blood Vessels

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Part II Blood Vessels
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Arteries

• Carries blood that leaves the heart.
• Right Ventricle pumps blood into the arteries
  that go to the lungs.
• Left Ventricle pumps blood into the aorta.
• First branches of arteries are called coronary
  arteries- carry blood to heart

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Arteries

• Each artery branches to smaller and smaller
  arteries.
• Walls are very thick- 3 cell layers
• Strong and flexible
• Able to withstand a lot of pressure

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Arteries

• Pulse- cause by the alternating expansion and
  relaxation of the artery wall

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Capillaries

• Tiny blood vessels where materials are exchanged
  between blood and bodys cells.
• Walls are only 1 cell layer thick
• Transfer materials such as O2 and glucose

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Veins

• After blood travels through capillaries, blood
  returns to heart by veins
• 3 layers thick, but are thinner than arteries

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Blood Pressure

• Caused by the force with which the ventricles
  contract
• Pushes against the walls of blood vessels
• Pressure farther from heart is less

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Blood Pressure

• Measured using a sphygmomanometer.
• Top number (higher) measure of blood pressure
  when ventricles contract
• Bottom number (lower) measure of blood pressure
  when ventricles relax.