Final answer:
The heart is a muscular organ located in the chest that pumps blood through the blood vessels. It has four chambers and functions as a pump to supply oxygen and nutrients to cells and remove metabolic wastes.
Step-by-step explanation:
The heart is a muscular organ located in the chest that pumps blood through the blood vessels by contracting rhythmically. It consists of four chambers, including two atria and two ventricles, which are separated by valves to ensure blood flows in one direction. The heart's structure is specifically designed to function as a pump, supplying oxygen and nutrients to the body's cells and removing metabolic wastes.