Blood Vessels.pdf - CARDIOVASCULAR SYSTEM BLOOD VESSELS...

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CARDIOVASCULAR SYSTEM: BLOOD VESSELS BIOL-071 2014-2015 1 Introduction 1. Functions of blood vessels in cardiovascular system a. Transport b. Exchange 2. Functional classification of blood vessels a. Arteries carry blood away from heart b. Veins carry blood toward heart c. Capillaries site of exchange, connect arteries & veins Structure and Histology 1. General structure (mid-sized blood vessel) Fig. 22.1 a. Outer layer = tunica adventitia i. Dense irregular CT b. Middle layer = tunica media i. Smooth muscle tissue c. Inner layer = tunica intima i. Areolar CT + simple squamous epithelium ii. Simple squamous epithelium = endothelium 2. Comparison of arteries & veins Fig. 22.1 Arteries Veins Thicker wall (thicker tunica media) Thinner wall (thinner tunica media) Smaller inner diameter Larger inner diameter <40% of blood volume 60% of blood volume (more distensible) Higher blood pressure Lower blood pressure 3. Variations in basic structure Fig. 22.1 a. Elastic vs. muscular arteries i. Elastic arteries
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