Key Stage 3 (KS3) General Knowledge Practice Test

The heart is the organ responsible for pumping blood throughout the body. It acts as a muscular pump that circulates blood, delivering oxygen and nutrients to tissues while removing carbon dioxide and waste products. The heart's unique structure, which includes four chambers (two atria and two ventricles), allows it to efficiently manage the flow of blood. The right side of the heart receives deoxygenated blood from the body and pumps it to the lungs for oxygenation. The left side receives oxygen-rich blood from the lungs and pumps it out to the rest of the body. This continuous cycle is vital for maintaining the body’s overall health and ensuring that all organs receive the blood supply necessary for proper functioning.