Blood flows in an aorta of radius 4.38mm at 32.5cm/s. Calculate the volume flow rate. one Although the cross-sectional area of a capillary is much smaller than that of the aorta, there are many capillaries, so their total cross-sectional area is much larger. If all the blood from the aorta flows into the capillaries and the speed of flow through the capillaries is 0.90mm/s, calculate the total cross-sectional area of the capillaries. Submit Answer Tries 0/10