Human heart is made up of how many chambers?

The human heart is a muscular organ responsible for pumping blood throughout the body. It consists of four chambers: two upper chambers called the atria (right and left atrium) and two lower chambers called the ventricles (right and left ventricle).

• The right atrium receives deoxygenated blood from the body.
• The right ventricle pumps this deoxygenated blood to the lungs.
• The left atrium receives oxygenated blood from the lungs.
• The left ventricle pumps the oxygenated blood to the rest of the body.

This four-chambered structure prevents the mixing of oxygenated and deoxygenated blood, which allows for a highly efficient supply of oxygen to the body. This is a characteristic feature of mammals and birds, whereas amphibians and most reptiles have three-chambered hearts, and fish have two-chambered hearts.