Heart (organ)

The heart is a muscular organ about the size of a fist that functions as the body's pump. It continuously contracts to propel blood through the circulatory system, delivering oxygen and nutrients to tissues and removing waste products. The heart has four chambers: two upper atria and two lower ventricles. It operates through a coordinated electrical system that controls heartbeat and rhythm. The heart's efficiency is vital for overall health, and it works tirelessly every moment to sustain life by maintaining proper blood flow throughout the body.