Blood Vessels

• Describe the direction of blood flow in the body

  Heart → Arteries → Capillaries → Veins → Heart
• When is there a decrease in blood pressure?

  When blood moves away from the heart
• Name the parts of blood vessels (inwards from edge):

  Connective Tissue → Muscle Tissue → Endothelium → Lumen (Can't Make Elephants Laugh)
• Why do the elastic walls of the arteries stretch and recoil?

  To accommodate the surge of blood after each contraction of the heart
• In which blood vessel is blood pressure higher?

  Arteries
• Why do veins have valves?

  To prevent the back flow of blood
• How is blood flow controlled in arteries?

  The smooth muscle can contract causing vasoconstriction or relax causing vasodilation
• Describe the function of the capillaries

  Allow exchange of substances with tissues through their thin walls