Blood
Blood is a liquid that flows through the body. It carries nutrients, dissolved substances, special proteins and also waste. It contains three main types of cells:
- red blood cells or RBCs that carry oxygen
- white blood cells or WBCs that protect the body against germs and other harmful substances
- platelets that help blood to clot
Functions of blood
- It carries oxygen to all parts of the body.
- It carries carbon dioxide from all parts of the body to the lungs.
- It transports nutrients to every part of the body.
- It transports waste from every part of the body to the lungs, skin or kidneys.
- It helps the body fight against germs and other harmful substances that enter the body.
