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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Sorta, your cardiovascular system does work in a loop but veins are only the return path. The blood goes from the heart to the lungs where the red blood cells get oxygen, then back to get pumped throughout the body using arteries. From there, arteries connect to capillaries. Tiny vessels where the RBCs exchange oxygen for carbon dioxide and the cells take nutrients from the plasma and deposit their waste. The capillaries then connect to veins which bring the exhausted blood back to the heart.
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