In the human circulatory system, blood flows through the following structures in which order? (1) vena cava, (2) left ventricle, (3) pulmonary vein, (4) right atrium, (5) aorta, (6) pulmonary capillaries
a. 1 - 4 - 6 - 3 - 2 - 5
b. 1 - 5 - 3 - 6 - 2 - 4
c. 1 - 2 - 6 - 3 - 4 - 5
d. 1 - 4 - 3 - 6 - 2 - 5
e. 1 - 2 - 3 - 6 - 4 - 5
Answer: a. 1 - 4 - 6 - 3 - 2 - 5
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