IMG_0001 - THE BLOOD VESSELS Structure Types of vessels...

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THE BLOOD VESSELS Structure Types of vessels Correlation between blood pressure and structure GENERAL STUCTURE OF VESSEL WALLS Tkee tunics (layers) surround the lumen (blood space) of blood vessels: 1. Intima: Innermost layer-in contact with the blood Endothelium lines all vessels and forms a friction-free lining 2. Media Smooth muscle-contracts and relaxes, arranged in a circuiar fashion Elastin-stretches and recoils 3. Adventita Outermost layer Loosely woven collagen fibers that protect and also are anchored to the surrounding structures THE THREE TYPES OF VESSELS I. ARTERIES Take blood away from the heart Exposed to the highest pressure ) thickest tunica media Stretch and recoil Constrict and dilate Types: Elastic -Closest to the heart, for example, aorta -Feel the pressure fluctuations and as such stretch with each beat of the heart -Expand and recoil with systole and diastole to propel the blood -Experience the greatest pressure and the widest variations in pressure (120-80 mm Hg) -Most amount of elastin ) expansion /oo
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IMG_0001 - THE BLOOD VESSELS Structure Types of vessels...

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