blood cell

Blood is composed of cells and fluid, contain many inorganic and organic molecules. Functions of blood could be falls into three categories: transport, defense and regulation, they all have different function. Blood transport oxygen and nutrients and removes waste from the body. It also transports hormones, which control the body's organ. Blood defense pathogens such as bacteria and viruses and it clots, which prevents the loss of blood. In regulatory functions, blood helps maintain body …

…B, AB, and O. It is important to determine their own blood, because whenever that person have an anti-A with and type A blood, the red blood cell will clumping and it will cause blood to stop circulating in small blood vessel which may cause that person to death and when we do a blood transfusions, the donor match with the recipient's blood. This is how the ABO system works, to determine each own blood.