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.
Hole's Anatomy 12th edition, pg 287 states: Muscle fibers, and in a way â¦ muscles themselves, are basically collections of sarcomeres, discussed later in this chapter as the functional units of muscle contraction. sarcomere.