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 left side of the heart pumps oxygenated blood around the body.
Cells take out oxygen and put back waste CO2.
De-oxygenated blood returns to the right side of the heart, and is pumped into the lungs.
The lungs exchange CO2 for oxygen and the “good” blood goes back to the left side of the heart.
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