Answer – The heart has four chambers; the two upper chambers are called the atria, while the two lower chambers are called the ventricles. 

Explanation:

In order for the cells of the body to function optimally, the blood carries oxygen to them. The oxygenation of blood occurs in the lungs, from where it is sent to the heart. The heart is the primary organ in the circulatory system, responsible for the pumping action that sends oxygenated blood to the rest of the body. It also receives the deoxygenated blood, which it sends to the lungs to be oxygenated. 

In order for the heart to function in the manner required of it, it has four chambers. The upper chambers are called the left and right atria (or auricles), and the lower chambers are called the left and right ventricles. The atria (singular atrium) receive blood, while the ventricles push them out of the heart. The movement of the walls of these chambers and the valves between keep the blood flowing and regulate the heartbeat. 

The right atrium receives the deoxygenated blood from the body and passes it to the right ventricle below it. The right ventricle pushes it up to the lungs to receive oxygen. Once oxygenated, the blood now travels back to the heart, entering the left atrium. From here, it moves to the last chamber, the left ventricle, that pumps it into the aorta to be transported throughout the body.

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