Normal Blood Flow Through Trees

Blood flows are not uniform at the microscopic level. How vessels are arrayed can create non-uniform flow patterns. Tissues differ as to placements of their capillaries. In cardiac muscle, capillaries lie in parallel arrays alongside the muscle cells, and a single straight capillary may extend for centimeters. In heart muscle, many arte-rioles feed into one large dense network of two to four thousand capillaries per millimeter of cross-sectional area of tissue. Cardiac capillaries appear ideally situated to deliver oxygen and nutrients rapidly to active cardiac muscle. Other capillary beds in other organs have different arrays.

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