Blood is a substance circulating through our bodies which is crucial to life! It is made up of different blood cells. These blood cells are grouped into 3 categories: Platelets, White blood cells, and Red blood cells. Each of these cells have a unique role.
Red blood cells carry oxygen; white blood cells (which have different subtypes) assist in fighting infection, and Platelets help form clots which are important to stop bleeding in wound healing. All these blood cells are held in the fluid part of blood, called plasma.