ELI5: Explain Like I'm 5

blood cells

Blood cells are the tiny cells in our blood that help us stay healthy! Those cells move around our body carrying oxygen and other helpful things that help our bodies work. They look like little discs and come in different types. Red blood cells help our bodies get oxygen and deliver it to the organs; white blood cells help our bodies fight infections by attacking germs and bacteria; and platelets help our bodies heal by helping us make new blood cells.