As blood moves through a vein or artery, its velocity v is greatest along the central axis and decreases as the distance r from the central axis increases (see the figure below). For an artery with radius 0.9 cm, v (in cm/s) is given as a function of r (in cm) by v = g(r) = 18,500(0.81 − r^2).

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As blood moves through a vein or artery its velocity v is greatest along the central axis and decreases as the distance r from the central axis increases see th class=