Military forces have worn distinctive uniform items for centuries to create a psychological advantage and boost their esprit de corps, but the military use of berets is a relatively recent phenomenon. In the 16th and 17th centuries, the Blue Bonnet became a de facto symbol of Scottish Jacobite forces.
Muscle cells have adapted to their job by contracting and relaxing.  When calcium levels are increased the muscle cells contract. On the  other hand, when calcium levels droâ¦p the muscle cells get relaxed.
Each somitic area (occipital, cervical, thoracic, lumbar and sacral) contributes to the formation of muscles. Muscle satellite cells are formed during embryonic development as well, and persist in a quiescent state in the adult muscles, ensuring restoration of muscle cells following any type of muscle injury.natomical Structure and Function of the Skeletal Muscle: Skeletal muscle, also called striated muscle, is a dense, fibrous contractile tissue which exists throughout the entire body, and functions to allow body movement by applying force to bones and joints, via contraction.