Deoxygenated blood from the leg muscle returns to the heart, moves to the lungs to be oxygenated, goes back to the heart, and flows through the body again.
The circulatory system is a complex system in the body whose function is to keep the flow of oxygenated blood throughout the body.
This system is composed of multiple steps that create a cycle and usually involve the following organs:
- The heart.
- The lungs.
- Blood vessels.
- Veins
- Arteries
Here are the steps if we start with deoxygenated blood in the muscles.
- The deoxygenated blood returns to the heart through the veins. This blood has no oxygen because this has been used.
- An important vein known as the vena cava pumps the blood into the right atrium of the heart.
- The blood then floods into the right ventricle.
- Later, as the heart beats the blood moves from the heart to the pulmonary artery.
- In the lungs, the blood is oxygenated and then it returns to the heart.
- The blood goes to the left atrium and moves to the left ventricle.
- The blood is pumped from the heart to the rest of the body including muscles.
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