24 th november, 2011 textbook page - 180

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BLOOD VESSELS. 24 th November, 2011 Textbook Page - 180. What are Blood Vessels?. A part of the circulatory system that transports blood throughout the body. Network of vessels that transport blood throughout the body. THE VASCULAR SYSTEM. ARTERIES. - PowerPoint PPT Presentation


  • 24th November, 2011Textbook Page - 180

  • What are Blood Vessels?A part of the circulatory system that transports blood throughout the body.

  • Word Element Refers toAort/oAorta Arteri/oArtery Phleb/oVeinVenoVeinAngi/oVesselVas/oVesselVascul/oBlood vessels-emiaBlood Hem/o , hemat/oBlood Coron/oCrown; encircling such as in the coronary blood vessels encircling the heartDilate To open up a hollow structureEctasis DilationConstrict To narrow a hollow structure

  • Network of vessels that transport blood throughout the body.

  • ArteriesCapillariesVeins Thick-walled Elastic Carry oxygenated blood away from the heart to different organs (except pulmonary arteries, they carry deoxygenated blood) Arterioles:Small branches of the arteries Carry oxygenated blood to capillariesRegulate blood distribution to various tissues of the body Connect arterial and venous systemOne cell thickResponsible for the exchange of gases and nutrients with the tissues Return deoxygenated blood to the heart (except pulmonary veins carry oxygenated blood).Have valves that permits one directional flow

    Venules: Smaller branches of veins Receive blood from the capillaries and transport it to the veins Lumen of a blood vessel is the opening through which blood flows The nervous system can stimulate the lumen to be more open called vasodilation or more closed called vasoconstriction.Together these form a closed delivery system of vessels for delivering oxygen and nutrients to body cells, also removes waste products.

  • ARTERIESBlood is ejected out at a high velocity and with high pressureWalls have to be strong (to withstand the pressure), elastic and muscular.Walls dilate when the pressure pushes outwards, and later bounce back to normal shape This bounce commonly known as the pulse is felt in some areas of our body such as at the wrist.

  • VEINSThe vein wall has the same layers as the arterial wall, but it is much thinner. Low Pressure Smooth Flow when we are lying down at rest.



  • DISEASEMEANINGAneurysmA localized dilation of an artery or other vesselAngiospasmSpasm in blood vesselsAngiostenosis Narrowing of a blood vesselArteriospasmSpasm of an arteryArteriostenosisNarrowing of an arteryArteritisInflammation of an artery/arteriesAtheromaFatty deposit/plaque within arterial wallsAtrial fibrillationRapid, ineffective contraction of the atriumDisseminated Intravascular Coagulation(DIC)Widespread clotting in the blood vessels causing obstruction to the tissuesDyscrasiaGeneral term for blood disorderThrombusBlood Clot attached to an interior wall of a vein or an arteryCardiac CatheterizationProcedure where a catheter is inserted into the heart. This is used for the diagnosis of blockages and their treatments.StatinsA type of cholesterol lowering drugStentDevice implanted into the artery to open and provide support to the arterial wall.



    *It is thinner as the flow is smoother and the vein wall does not have to withstand the pressure of the heart pumping.the blood is not being pushed back by the heart and so it has Low Pressure and fairly smooth Flow when you are lying down at rest.

    *Starting at the heart, and looking at the red blood on the right side of the picture:Oxygenated blood (red) is pumped from the heart through the Aorta and then the arteries to the tissues.The tissues use the oxygen and exchange it for carbon dioxide and the blood turns blue - deoxygenated blood.The blue deoxygenated blood is pumped up the veins into the vena cava and then the heart.Here it is then pumped into the lungs.The lungs exchange the carbon dioxide for oxygen and the blood turns red again.The newly oxygenated blood is pumped back to the heart and the process starts again.Of note - all vessels taking blood AWAY from the heart are called Arteries.All blood vessels taking blood towards the heart are called Veins.However, in the vessels going to and from the lungs (called the pulmonary circulation), the arteries carry deoxygenated blood (blue) and the veins carry oxygenated blood (red).This is the reverse from the normal situation.



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