The Circulation of the Blood pdf online. The circulatory system functions to deliver oxygen, nutrients, and hormones to all In mammals the circulatory system has two major circuits the blood follows: a. When a cow produces 60 liters of milk per day, 30,000 liters of blood are circulation through the mammary gland. This represents a blood flow of 1250 liters per The lungs are responsible for delivering oxygen to the blood, and the heart circulates the blood through the This round trip is known as the circulation of blood. Methods used since 1922 for determining the speed1 with which blood flows in man depend for the most part on production of a reaction in one part of the body The heart has the highest oxygen consumption per tissue mass of all human organs. The rest- ing coronary blood flow is $250 ml min