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  Human Heart Heart is a vital muscular organ, about the size of a clenched fist, that acts as a pump, circulating blood throughout the body. It is the central organ of the circulatory system, responsible for delivering oxygen and nutrients to all cells while removing waste products like carbon dioxide. Other definition: The heart is a vital muscular organ that acts as the engine of the circulatory system, pumping blood throughout the body to deliver oxygen, nutrients, and hormones and remove wastes like carbon dioxide. Without the heart, life would not be possible, as every cell in the body depends on the constant supply of blood. Structure and Anatomy of the Heart Shape : Hollow, cone-shaped. Location : Lies in the center of the chest (mediastinum) but slightly tilted to the left side, behind the sternum. Size : Roughly the size of a person's fist. Weight : 250–300 grams in adults. Heart Chambers The heart is divided into four chambers : Chamber Function Right At...