WHAT IS A Bl d BANK? .. its blood bank is a place where donated blood is stored that can later be used in transfusions. People can 1) to the blood bank by making a donation. However, before their donated blood can be used, scientists must 2) a test to 3) type. Our blood types are something we 4) from our parents. It's important for people to receive a compatible blood type because when incompatible types mix, the blood cells 5) together. In a patient, this could cause the blood to 6) and could even be fatal.