Distinguishing characteristics of veins include which of the following?

A. Veins have walls consisting only of endothelial cells.
B. All veins have valves to ensure one-way movement of blood.
C. All veins carry deoxygenated blood.
D. All veins carry blood toward the heart.
E. All veins have thick, elastic walls.


Answer: D

Anatomy & Physiology

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