Muscle function: 1. contraction for locomotion and skeletal movement. 2. contraction for propulsion. 3. contraction for pressure regulation. Muscle classification: muscle tissue may be classified according to a morphological classification or a functional classification.ardiac muscle cells are not as long as skeletal muscles cells and often are branched cells. Cardiac muscle cells may be mononucleated or binucleated. In either case the nuclei are located centrally in the cell. Cardiac muscle is also striated.
1 A rheumatologist (if your back pain is caused by arthritis or other joint problem)  A physical therapist and/or occupational therapist (to help you learn to move and exercise in ways that don't worsen the pain but may improve it)
An orthopedic doctor is a board certified M.D. who specializes in problems - from head to toes - of the musculoskeletal system. This includes, of course, the spine. An orthopedist might address conditions such as ruptured discs, scoliosis or other types of neck or low back pain. Some of the procedures performed by orthopedic surgeons can also be done by neurosurgeons (see below.) Examples of such surgeries include spinal fusion, discectomies and more.