Many of the symptoms you describe are vague and could be due to a number of things including Provera. Some of the common side effects of this medication include weight gain, weak bones, headaches, fatigue, swelling. These symptoms could also be caused by a number of things such as thyroid problems.
Myofibrils are assembled of repeated structures called sarcomeres â the smallest functional unit of muscle fiber. Each sarcomere is formed of actin (called thin) and myosin (called thick) filaments arranged in a precise order and of protein complexes which support the filament structures.
More about the contents of cells generally, is available on the page about animal cells. The components of skeletal muscle cells that are specific to muscle tissue are myofibrils. 1  Each muscle fibre ( muscle cell ) is covered by a plasma membrane sheath which is called the sarcolemma.ore about the contents of cells generally, is available on the page about animal cells. The components of skeletal muscle cells that are specific to muscle tissue are myofibrils. 1  Each muscle fibre ( muscle cell ) is covered by a plasma membrane sheath which is called the sarcolemma.