Complex sentence: Cardiac muscle is very specialized, as it is the only type of muscle that has an internal rhythm i.e. it is MYOGENIC which means that it can naturally contract and relax without receiving electrical impulses from nerves.
Split into simpler sentences: Cardiac muscle is very specialized, as it is the only type of muscle that has an internal rhythm. I.e it is MYOGENIC which means that it can naturally contract and relax without receiving electrical impulses from nerves.