All blood vessels are lined with ________, a smooth inner layer that promotes the flow of blood
A) vasculature
B) pericardium
C) endothelium
D) Purkinje fibers
C
Explanation: A) Vasculature is a network of blood vessels.
B) The pericardium is a membrane around the heart.
C) Correct!
D) Purkinje fibers are in the conduction system of the heart.
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