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.
Confidence votes 32. They are called sacromeres and are the smallest functional 'contractile unit' of a muscle cells that includes myofibilaments, such as actin and myosin.Yes, the above answer is correct:he smallest unit of skeletal muscle is the muscle fiber or  myofiber. These fibers contain a lot of the nuclei, sarcomeres and  mitochondria.