science

 circulatory system The circulatory system is like a highway that runs through your body. It is responsible for carrying oxygen, nutrients, and waste products to and from the cells in your body. It works by pumping blood through a network of blood vessels.   Main Parts of the Circulatory System: Heart: The heart is a muscle that pumps blood throughout your body. It has four chambers: Two upper chambers called atria . Two lower chambers called ventricles . Blood Vessels: Arteries : Carry oxygen-rich blood from the heart to the rest of the body. Veins : Carry oxygen-poor blood back to the heart. Capillaries : Tiny blood vessels where the exchange of oxygen, nutrients, and waste happens. Blood: Blood carries oxygen, nutrients, and waste. It has red blood cells (carry oxygen), white blood cells (fight infection), platelets (help in clotting), and plasma (the liquid part). Key Functions of the Circulatory System: Transportation: Carries oxygen and nutrients to cells and removes wa...