Are all of your veins like little tiny loops where blood flows through, then back to the heart, or does blood sort of push and pull it’s way back and forth through your body? Basically, how the heck does the cardiovascular system work?
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The heart pushes blood out through arteries. The arteries divide and divide, eventually forming capillaries that are tiny blood vessels suffusing almost all your tissues, bringing oxygen to the cells. These combine again into larger and larger veins, bringing low oxygen blood back to the heart. The heart has two loops, pumping the blood from the veins to the lungs in order to get oxygenated (again dividing into capillaries and rejoining), then it returns to the heart and goes out the body anew.
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