EXERCISE 4 | BLOOD VESSEL STRUCTURE AND PATHS OF CIRCULATION Arteries and Veins Labeling Activity Longitudinal View (layer) (layer) (artery/vein) Tunica media (layer) (Smooth muscle) (artery/vein) (layer) one-way valve Tunica (layer) lumen Cross Sectional View Tunica media Figure 4.4: Arteries and veins. 39
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We'll focus on the layers of the blood vessel walls and the presence of one-way valves, which are characteristic of veins. ### Longitudinal View #### Show more…
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