This is one of the 3 main muscle stuctures of the human body
Others are as follows
- Cardiac Muscle
- Smooth Muscle

Skeletal muscle is referred to as a “striated muscle”.  This group attaches to bone
and allow for movement by applying force to Skeletal System.  The control is done
through nerve stimulation from the nervous system.  The muscle itself is wrapped
in a connective tissue.

Each muscle has two sides and are classified as
   -  Origin – is one end that attaches to a bone closer to the center of the body
   -  Insertion – is the other end that attaches to a joint that connects to a
second bone

Skeletal muscles are cylindrical in shape.  These muscles have fibers with many nuclei
called multinucleated.  Each cell has several thread-like fibers called myofibrils. 
The smallest aspect of a skeletal muscle is called a sarcomere.  Within the sacromere is a
myosin and actin proten filament.  This is the action process of the muscle.

Skeletal muscles are stimulated by acetylcholine which is released

1.)    This causes a chain event that “Excites” the cells.
2.)    Calcium ion is released which attaches to myofibrils to allow for muscular contraction.
4.)    Calcium affects the actin by binding to tropomysoin
3.)    ATP (Adenosine triphosphate) is required for muscular contraction

 
Skeletal muscle types
   -  Type I  -  slow twitch  -  Marathon runners have more of these
   -  Type II -  fast twitch  -  Sprinters and Weightlifters have more of these

*Type II are again divided into IIa, IIx, and IIb

Humans only have I, IIa, and IIx
  – other variations are found in other mammals