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Unit 4-Lecture 1.pptx - Unit 4-Systemic Circulation Lecture...

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Unit 4-Systemic Circulation Lecture 1-Blood Vessels
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Blood Vessels Blood is carried in a closed system of vessels that begins and ends at the heart The three major types of vessels are arteries, capillaries, and veins Arteries carry blood away from the heart, veins carry blood toward the heart Capillaries contact tissue cells and directly serve cellular needs
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Generalized Structure of Blood Vessels Arteries and veins are composed of three tunics. From deep to superficial they are: tunica interna, tunica media, and tunica externa Lumen – central blood-containing space surrounded by tunics Capillaries are composed of endothelium with sparse basal lamina This extremely thin type of vessel is ideally suited for gas and nutrient exchange
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Generalized Structure of Blood Vessels Figure 19.1b
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Tunics Tunica interna (tunica intima) Endothelial layer that lines the lumen of all vessels In vessels larger than 1 mm, a subendothelial connective tissue basement membrane is present Tunica media Smooth muscle and elastic fiber layer, regulated by sympathetic nervous system
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