575
CHAPTER FIFTEEN
Cardiovascular System
Artery
Vein
Valve
Lumen
Endothelium of
tunica interna
Connective tissue
(elastic and collagenous fibers)
Tunica media
Tunica externa
(a)
(b)
Endothelium
of tunica
interna
(c)
Lumen
Middle layer
(tunica
media)
Outer layer
(tunica
externa)
FIGURE 15.25
Blood vessels. (
a
) The wall of an artery. (
b
) The wall of a vein. (
c
) Note the structural diF
erences in these cross sections of an arteriole
(bottom) and a venule (top) (200
×
).
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