In the lungs, the blood exchanges the CO2 with the oxygen from the air.
What does the aorta artery do?
Distributes the oxygenated blood from the heart to all parts of the body.
What happens when blood arrives to the small intestine?
When blood arrives to the small intestine, it collects the digested nutrients. Then, blood carries oxygen and nutrients to every part of the body and exchanges it with carbon dioxide and waste substances.
What happens in the kidneys?
Blood transports waste substances to the kidneys which filter it and clean it.
What happens in the vena cava?
Blood carrying Carbon Dioxide enters the heart through the vena cava.