Circulatory system - blood vessels, Biology


  • Some vessles supply blood to wall of large vessels these are vessel of vessels or vasa vasorum.
  • Mainly artery and vein, 2 types of vessels present.
  • Third one is capillary - discovered by Marcillo Malpighi, thin, present in organ, only inner layer in wall present.
  • In man 10 billion capillaries present.
  • They may form 150,000 miles rope.
  • In vein blood flows mainly by contraction of body muscles & suction created by diastole of heart.
  • In wall of blood vessels 3 layers present.

1. Tunica Externa - Made up of connective tissue, collagen fibres present.

2. Tunica media - Thick, made up of smooth muscles arranged in circular way.

3. Tunica interna - Inner most layer. Outerly made up of yellow elastin fibre. Inner layer is of endothelial cells.

























Carry blood away from heart


Pure blood flows


(in pulmonary artery impure blood flows)


Blood flows with jerk


Blood flows with more pressure


Walls are thick


Lumen is narrow


Not collapse after death


Deeply placed


Valve absent


Wall firm

Towards heart


Impure blood flows


(In pulmonary vein pure blood flows)




Less pressure








Superficially placed


Present to check back flow



Posted Date: 10/2/2012 12:39:15 AM | Location : United States

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