Download - The Blood Vessels
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The Blood VesselsRoadways of the Body
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What do Blood Vessels Do?• Carry Blood!• Exchange nutrients, wastes, and
gases with tissues• Transport• Help maintain blood pressure• Direct blood flow to tissues (when
increased or decreased blood flow is required)
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Three types of blood vessels• Arteries• Veins• Capillaries
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Three major parts of blood vessels:• Tunica Intima:• The innermost layer; consists of
simple squamous epithelium• Tunica Media:• The middle layer; consists of smooth
muscle and elastic and collagen fibers
• Tunica Adventia:• The outermost layer; consists of
connective tissue
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Arteries:• Thick muscular walls• Blood moving under high pressure
and speed• Blood is oxygenated (except
pulmonary arteries)• Always take blood away from the
heart• Branch into arterioles• Arterioles branch into capillaries
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Capillaries:• Consist of a single layer of
endothelium only one cell thick• The site of nutrient, waste, and gas
exchange between the blood and the body cells
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Veins:• Capillaries flow into venules• Venules flow into veins• Veins have thinner walls• Blood moves under lower pressure
and slower speed• Veins need valves to keep blood
moving in the correct direction• Always take blood to the heart• Carry deoxygenated blood (except
the pulmonary veins)
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Heart Vessels:
1. Right common carotid artery2. Right internal jugular vein3. Right subclavian artery4. Brachiocephalic artery5. Brachiocepahlic vein6. Superior vena cava7. Left common carotid artery8. Left internal jugular vein9. Left subclavian artery10.Aortic arch
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Major Arteries:
1. Brachial2. Ascending aorta3. Subclavian4. Common carotid5. Brachiocephalic6. Descending aorta7. Coronary8. Abdominal aorta9. Common illiac10. femoral
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Major Veins:
1. Brachial2. Brachiocephalic3. Jugular4. Subclavian5. Superior vena cava6. Coronary7. Inferior vena cava8. Iliac9. Femoral10. Great saphenous
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