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BIOL&253Ch21NotesFall11

BIOL&253Ch21NotesFall11 - Ch 21 Blood Vessels and...

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1 Ch. 21 – Blood Vessels and Circulation Arteries – carry blood away from the heart – They are higher pressure vessels – They typically have a rounder lumen on microscope slides – They have a relatively thick wall compared to their lumen size Veins – carry blood towards the heart – They are lower pressure vessels – They are typically flattened on microscope slides – They have a relatively thin wall compared to their lumen size Capillaries – are the microscopic vessels that are the site of the exchange of gases, nutrients, wastes, etc. between blood and interstitial fluid Fig. 21-2, p. 723 The main types of blood vessels
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