A common result of heart disease is an enlarged heart . Heart muscle that is larger than normal functions inefficiently and causes other problems.
Smooth muscle maintains force without using much energy in a state called latch .
Muscle A muscle consists of thousands of muscle fibers, the cellular units of muscle. Each muscle fiber is made up of thousands of myofibrils. Myofibril Myofibrils contain filaments of actin and myosin. The filaments form an ordered array and make up sarcomeres, the functional units of muscle. According to the sliding filament theory, myosin heads bind actin filaments and move them during contraction.