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In page Capillary:
"In the lungs, special mechanisms have been adapted to meet the needs of increased necessity of blood flow during exercise. When the heart rate increases and more blood must flow through the lungs, capillaries are recruited and are also distended to make room for increased blood flow. This allows blood flow to increase while resistance decreases.[citation needed] Extreme exercise can make capillaries vulnerable, with a breaking point similar to that of collagen.[5]
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