EXERCISE Anatomy of Blood Vessels Lab Time/Date Name Microscopic Structure of the Blood Vessels 1. Cross-sectional views of an artery and of a vein are shown here. Identify each; on the lines to the sides, note the structural details that enabled you to make these identifications: 11 (vessel type) (vessel type) (a) (a) (b) (b) Now describe each tunic more fully by selecting its characteristics from the key below and placing the appropriate key letters on the answer lines. Tunica intima Tunica media Tunica externa Key: a. innermost tunic d. regulates blood vessel diameter b. most superficial tunic e. contains smooth muscle and elastin C. thin tunic of capillaries f. has a smooth surface to decrease resistance to blood flow

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