The Double Circulatory System
Science: KS3, topic 1.6.28
Double Circulatory System
The human circulatory system has three main parts: blood vessels, blood, and the heart. This system is called a double circulatory system. The blood passes through the heart twice in one circuit.
Blood enters the heart
- Deoxygenated blood from the body enters the right atrium of the heart.
Blood pumped to lungs
- The right ventricle pumps this deoxygenated blood to the lungs.
Lungs oxygenate the blood
- In the lungs, the blood exchanges carbon dioxide for oxygen. The blood becomes oxygenated.
Blood returns to heart
- Oxygenated blood goes back to the left atrium of the heart.
Blood pumped to the body
- The left ventricle pumps this oxygenated blood to the body.
Blood returns to the heart
- The body cells take the oxygen from the blood and give back carbon dioxide.
- The blood becomes deoxygenated again and goes back to the heart.
Test yourself on The Double Circulatory System
Why is the human circulatory system called a double circulatory system?
Which chamber of the heart receives deoxygenated blood from the body first?
The Double Circulatory System
What would happen if blood did not pass through the heart twice in one circuit?
Name the three main parts of the human circulatory system.