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Vessels & Lymphatic

Vessels & Lymphatic - Click to edit Master subtitle...

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Click to edit Master subtitle style 6/11/10 Blood Vessels Assigned reading: Chapter 18 (pp. 626-651)
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6/11/10 Structure of Blood Vessel Walls 3 Types of vessels: Arteries : take blood away from heart, to body tissues. HIGH pressure Capillaries : pickup/drop off the substances at the body’s tissues. MEDIUM pressure Veins : take blood toward heart. LOW pressure
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6/11/10 Structure of Blood Vessel Walls 3 Tunics (layers): Tunica intima : endothelium Tunica media : smooth muscle, elastic fibers, collagen Tunica externa : loose connective tissue that binds vessles to nearby structures, hold nerves and smaller vessels together
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6/11/10 Make up of vessel walls Arteries tend to have large ammounts of smooth muscle Used to regulate diameter (changing distribution or pressure) Arteries also have elastic fibers , providing pressure to blood Veins do not stretch much, but have some muscle to elevate pressure if needed Capillaries have only endothelium
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6/11/10 Types of Capillaries Capillaries are the site of exchange in the body. Modifications are made depending on the needs of the tissue served Continuous capillaries Fenestrated capillaries Sinusoudal capillaries
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6/11/10 Capillary beds
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