The internal lining of the cardiovascular system is formed by what tissue?
a. Tunica adventitia
b. Connective
c. Mesothelium
d. Endothelium
ANS: D
The endothelium, not the tunica adventitia, is the lining of blood vessels. Connective tissues help make up arterial walls but are not the lining of blood vessels. The mesothelium is a part of the pericardial cavity.
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