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Human heart has four chambers.

1. In humans, oxygen and carbon dioxide both have to be transported by the blood.
2. The heart has different chambers, the left and the right, to prevent oxygen rich blood from mixing with the blood containing carbon dioxide. The left half carries oxygenated blood and the right half carries
deoxygenated blood. 
3. Such separation allows a highly efficient supply of oxygen to the body.
4. This is essential in animals that have high every needs like humans, which constantly use energy to maintain their body temperature.
5. Each half is further divided into two chambers. The upper one is called atrium and the lower one is termed  as ventricle.
6. Therefore, the human heart has four chambers.