Circulatory system explained to kids

The circulatory system is a network of vessels and organs that transport blood throughout the body. The circulatory system is made up of the heart, blood, and blood vessels. The heart is a muscle that pumps blood through the body. The blood vessels are tubes that carry blood to and from the heart. The blood vessels include arteries, veins, and capillaries. Arteries carry blood away from the heart, veins carry blood back to the heart, and capillaries are tiny blood vessels that connect the arteries and veins. The blood is a fluid that carries oxygen, nutrients, and other substances throughout the body. The blood is made up of red blood cells, white blood cells, and platelets. Red blood cells carry oxygen to the body's tissues, white blood cells help fight infection, and platelets help the blood clot. The circulatory system is important because it delivers oxygen and nutrients to the body's tissues and removes waste products from the body. The circulatory system also helps to regulate body temperature and pH.