Which can be used to characterize blood flow in the human body?a: There is a unidirectional blood flow.b: Arteries always carry oxygenated blood.c: Veins always carry deoxygenated blood.d: Arteries carry blood away from the heart.e: Veins carry blood toward the heart.
A. a, d, e
B. d, e
C. b, c, d, e
D. a, b, c, d, e
E. a, c, d, e
Answer: A
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