Which of the following segments of the circulatory system has the highest velocity of blood flow?: (A) Aoa, (B) Aeries, (C) Capillaries, (D) Venules
Answer is A. The velocity of blood flow within each segment of the circulatory system is inversely propoional to the total cross-sectional area of the segment. Because the aoa has the smallest total cross-sectional area of all circulatory segments, it has the highest velocity of blood flow