Walking increases this to about 8 quarts, and a fit marathon runner might have 37 quarts [35 liters] of blood coursing through his heart every minute — a sevenfold increase over the resting volume!
فكل دقيقة ،‏ يعود نحو ٥ لترات من الدم الى القلب حتى عندما لا يتحرك الشخص !‏