Blood bank

A blood bank is like a hospital for blood. People can donate their blood to the blood bank, and the blood bank stores it until someone needs it. When someone needs blood because they are sick or hurt, the doctors at the hospital can ask the blood bank for blood that matches what the person needs. The blood bank takes the blood from its storage and gives it to the doctors, who then give it to the person who needs it. This helps people who need blood to stay healthy or get better.