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Blood enters the right side of your heart, then flows into your lungs, where it picks up oxygen.
Then the blood flows into the left side of your heart, and is pumped to the rest of your body - delivering the oxygen and nutrients.
On its path back to the heart, your blood picks up carbon dioxide and waste, and your liver and kidneys filter it out.
Finally, the blood returns to the right side of your heart, and is ready to be sent off again for oxygen. This completes the cycle.