### body part | organ | muscle:

Skeletal muscle
* All skeletal muscle possesses both types of fibers in varying amounts.
* Most skeletal muscles consist of fiber
  - many muscle fiber
  - several fascicles
  - generate heat
* Most skeletal muscles perform functions
  - same functions
* accounts for forty percent of the weight of the average man.
* act both ways because they work in pairs
  - on the bones that serve as a system of levers
* adapt to exercise in special ways, depending on how they are required to work.
* are attached to the bones of the skeleton
  - important in locomotion
  - made in two pairs the contract with each other
* are responsible for body movement and maintaining joint stability
  - bone movement, and are discussed further in the next section
  - the movement, posture and heat production of the body
  - sheathed by a tough layer of connective tissue called the epimysium
* are the muscles involved with voluntary movement, like walking and talking
  - only 'voluntary' muscles
  - primary sites of glutamine concentration
* associated with the axial skeleton plays a role in maintaining posture.
* attach to bones, and when they contract they pull on the bones - causing movement.
* can then burn the fat transported through blood.
* comprises about half of a person's lean body weight.
* comprises the familiar gross anatomic muscle organs
  - grossanatomic muscle organs
* connect to bone, ligaments and tendons to allow movement.
* consists of a wide variety of physiologically and biochemically distinct phenotypes.
* contain some of the longest lived cells.
* contains dermatan sulfate, chondroitin sulfate, and heparan sulfate proteoglycans.
* control actions.
* create motion by pulling on tough cords of connective tissue called tendons.
* features in multiple sclerosis.
* generates heat as a by-product of muscle activity.
* give shape to the body and makes possible the movements in our body.
* has a complex structure that is essential to how it contracts
  - an adaptation that allows the action potential to spread deep within the fiber
  - long cells that begin separate but fuse together
* help the body move.
* is able to react in a rapid, dynamic way to metabolic and mechanical stimuli
  - arranged anatomically symmetrical
  - attached to the external dermal sheath allowing voluntary control of the hair
  - called striated, because it has a striped apearance from overlaping filaments
  - controlled by motor neurons and can contract rapidly
  - deep brown in color due to the presence of a pigmented protein called myoglobin
  - designed as a bundle within a bundle arrangement
* is found in many sizes and various shapes
  - the trachea
  - in reality a syncytium
  - one of the major storage units for glycogen, which is formed from glucose
  - responsible for voluntary movements of limbs, digits, and other structures
  - stimulated by ACh because the receptor is of a type called nicotinic
  - striated in appearance
  - the main source of catabolized protein, but heart muscle contributes as well
* is the most common type of muscle in the human body
  - highly organized contractile apparatus of any cell type
  - primary tissue for insulin-stimulated glucose uptake
* is under conscious control
* maintain posture, cause movement, and produce heat.
* major producer of glutamine.
* make up a large part of the legs, arms, abdomen, chest, neck, and face.
* move and support bones.
* moves the skeleton and organs like the tongue and eye.
* produce movement by lengthening.
* propels the skeletal system and is made up of giant cells called muscle fibers.
* pull on ligaments and tendons to cause movement.
* remarkably plastic tissue.
* require innervation by LMNs to contract.
* shorten and pull on bones to cause movement of body parts.
* surround the bones of the body.
* undergo specific alterations that are related to the aging process.
* use both fat and sugar for energy.
* vary greatly in size, depending on their function.
+ Muscle, Types of muscles: Tissues
  * They move the jaw up and down so that food can be chewed. Skeletal muscles are the only 'voluntary' muscles. This means they are the only muscle that you can choose to move.