The answer is A. The organ that pumps the blood throughout the body is the heart. In humans, the heart is located near the left chest and for animals, the location of this organ varies depending on the species but is usually in between the lungs. A human’s heart has four chambers, the upper right and left atria and the lower right and left ventricles.
Blood flows in one direction through the valves to prevent uncleaned blood circulates in the body. The heart pumps oxygenated blood from the lungs to all the organs. The regular heartbeat of a person is 72 beats per minute and it increases when a person does an exercise.