Which of these statements 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 always carry blood away from the heart.
e. Veins always carry blood toward the heart.

Question

Quizplus · Accepted Answer

Statement a is correct as blood flow in the human body is unidirectional due to the presence of one-way valves in veins. Statement b is incorrect as arteries may sometimes carry deoxygenated blood (e.g. pulmonary artery). Statement c is incorrect as veins may sometimes carry oxygenated blood (e.g. pulmonary vein). Statement d is correct as arteries always carry blood away from the heart, while statement e is incorrect as some veins (e.g. renal veins) carry blood away from the heart. Therefore, only choice C is correct.

Which of These Statements Can Be Used to Characterize Blood