So cardiac muscle cells found in the heart and skeleton muscle cell is basically found around the bone. Now, cardiac muscle cells are found in a rich oxygen environment, but it's the skeleton muscle cell that is found usually in a lower oxygen environment. But both of these different types of cells found under different conditions must carry out the same type of biochemical process, namely let's say glycolysis. So they both have to be able to metabolize glycolysis glucose in the process of glycolysis. And in fact, skeleton muscle cells and cardiac muscle cells actually use ISMES in the process of glycolysis. So remember a specific type of enzyme that we spoke of previously.