Biology, 09.11.2019 01:31, jolleyrancher78

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.

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Which can be used to characterize blood flow in the human body?
a: there is a unidirectiona...