A. Dead animals will smell until they are completely decomposed or until they are dried out, whichever comes first. It goes without saying that the larger the animal, the more biomass there is to rot, the stronger the smell will be, and the longer the smell will last.
When cells are damaged by disease or injury, large amounts of these leak out, causing blood tests to show that enzymes are elevated above normal. (You can roughly compare this situation to a car that's leaking oil. Leaks in many parts of the engine can have the same result: oil all over your driveway.)
CPK - CPK or CK is an enzyme that's found in the brain and the muscles of the body. Strenuous exercise as well as a heart attack can cause increases in CPK. This makes clear the point of evaluating an abnormal test result in the context of other factors.