Transporting nutrients to the cells of your body is the job of your circulatory system. ... Nutrients are transported throughout your body through your blood via capillaries, tiny blood vessels that connect arteries to veins. Nutrients, oxygen and wastes all pass in and out of your blood through the capillary walls
Oxygen enters the lungs, then passes through the alveoli and into the blood. The oxygen is carried around the body in blood vessels. Carbon dioxide moves into the blood capillaries and is brought to the lungs to be released into the air during exhalation
