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.
A sarcomere is the most basic functional unit of a muscle fiber, which makes up striated muscle.uscle movement happens when the filaments slide across each other within the muscular bands. The sliding filament model is made possible by the interaction of the actin and myosin proteins within the filaments.