ELASTIC ARTERIES

  • large arteries, aorta
  • conduct flow w/ little energy loss
  • distensible due to large elastic component of wall
  • transiently store blood during ventricular ejection
  • recoil during ventricular relaxation
  • maintain flow to peripheral arteries

MUSCULAR ARTERIES

  • small arteries
  • bring blood to organs
  • minor factor in TPR

ARTERIOLES

  • regulate flow by changing D
  • major factor in TPR

TERMINAL ARTERIOLES

  • pre-capillary spinchters
  • fine tuning for capillary network pressure, flow and exchange

CAPILLARIES

  • blood-tissue exchange
  • diameter doesn’t change
  • endothelial cells of capillaries release vasoactive substances, control diameter

VENULES/VEINS

  • thin walled but have some VSM
  • store/mobilize blood volume