The circulatory system moves blood around the body. Blood is a tissue that transports nutrients and oxygen to cells via red blood cells and white blood cells. There are four main blood types - A, B, AB, and O - which are determined by the presence or absence of antigens on red blood cell surfaces. Mixing incompatible blood types during a transfusion can cause clotting and potentially death due to antibody reactions between different blood antigens.

1. R. Miller

8. Type Can Receive Can Donate To A A, O A, AB B B, O B, AB AB All types AB O O All types