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The cross-sectional area of a certain person's aorta (the major blood vessel emerging from the heart)...

The cross-sectional area of a certain person's aorta (the major blood vessel emerging from the heart) is 3.0 cm2, and the speed of the blood through it is 35 cm/s. A typical capillary has a cross-sectional area of 2.7 x 10-7 cm2 and a flow speed of 0.058 cm/s. How many capillaries does the person have?

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