The heart is a muscular organ in most animals, including humans, that pumps blood through the circulatory system. It is responsible for circulating oxygen and nutrients to the body's tissues and removing carbon dioxide and other wastes. Here are some key points about the heart: Anatomy of the Heart: Location: The heart is located in the chest cavity, slightly to the left of the center. Size: It's roughly the size of a fist in an adult human. Structure: The heart is divided into four chambers: Right Atrium: Receives deoxygenated blood from the body. Right Ventricle: Pumps deoxygenated blood to the lungs for oxygenation. Left Atrium: Receives oxygenated blood from the lungs. Left Ventricle: Pumps oxygenated blood to the rest of the body.The heart is a muscular organ in most animals, including humans, that pumps blood through the circulatory system. It is responsible for circulating oxygen and nutrients to the body's tissues and removing carbon dioxide and other wastes. Here are some key points about the heart: Anatomy of the Heart: Location: The heart is located in the chest cavity, slightly to the left of the center. Size: It's roughly the size of a fist in an adult human. Structure: The heart is divided into four chambers: Right Atrium: Receives deoxygenated blood from the body. Right Ventricle: Pumps deoxygenated blood to the lungs for oxygenation. Left Atrium: Receives oxygenated blood from the lungs. Left Ventricle: Pumps oxygenated blood to the rest of the body.