WebMD Symptom Checker helps you find the most common medical conditions indicated by the symptoms muscle weakness and weight loss (unintentional) including Lack of exercise, Hypocalcemia, and Multiple sclerosis. There are 44 conditions associated with muscle weakness and weight loss (unintentional).
What is the smallest structure in biology? Electrons Electrons are the smallest part of an atom. However, in Biology, the smallest unit is an atom, which make up molecules, compounds, organelles, cells, tissues, orgâ¦ans, organ systems, organisms, populations, spheres, and eventually everything. 1 person found this useful.
As we know myofibrils are the contractile units that make up each muscle fibre. Myofibrils can be looked upon as the building blocks of muscle and contain units called sarcomeres. Sarcomeres are the smallest functional unit of skeletal muscle and are composed of two protein filaments; actin and myosin. Actin is a thin filament and myosin is a thick filament, as shown on the following diagram, and it is the interaction between these two filaments that causes a muscle to contract and shorten.