White blood cells form part of the body's immune system, they are mostly formed by Neutrophils and Lymphocytes. White blood cells have access to most parts of the body since they're located in our blood, which flows throughout the body, and if there is any need they can pass through our blood vessels and migrate into specific tissues within our body.
because it is hard to breakdown fat in a very short time while ATP can be broken down in a very short time.Fats have a very strong bond of molecular chains and this makes it hard to breakdown quickly
