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 muscle fiber consists of a bundle of muscle myofibrils. 4. muscle myofibril = contains thousands of sarcomeres-sometimes as many as 10,000 sarcomere units end-to-end. 5. sarcomere = is the functional unit of a muscle contraction because it is this structure that actually shortens during a contraction.