THE BLOOD NETWORK

The heart has four main chambers. The right side of the heart sends blood to the lungs to pick up oxygen. The left side of the heart sends that oxygen-rich blood out to the rest of the body. Arteries carry blood away from the heart, veins bring blood back to the heart, and tiny capillaries allow oxygen and nutrients to move into the cells.
The lungs play a major role in this system. When you breathe in, oxygen enters your blood. When you breathe out, carbon dioxide leaves your body. This constant exchange keeps your cells alive and your organs working. Your brain, muscles, kidneys, liver, stomach, and skin all depend on this flow.
The circulatory system also helps remove waste. As cells use oxygen and nutrients, they create waste products. Blood carries those wastes away so the body can clean, filter, and remove them. This is why circulation is not just about movement; it is about survival, repair, and balance.



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