### cell | vegetative cell:

Muscle cell
* All muscle cells are contractile
  - excitable
  - in a constant state of synthesis and degradation
* Some muscle cells are part of anuses
  - muscles
  - sphincters
  - urethras
  - uteruses
  - wombs
* are a body s natural flab fighters
  - animal cells
  - bound together by perimysium into bundles called fascicles
  - elongated
  - examples of specialized cells
  - excitable because the membrane of each cell is electrically charged
  - extremely abundant and accessible
  - fibre
  - filled with proteins called 'actin' and 'myosin'
  - most sensitive to insulin two hours after exercise
  - part of muscles
  - precious fat-burning factories
  - smooth with nuclei in cytons called myoblasts
  - the first cell type to be immortalised
  - typically longer than they are wide
* become less able to let the hormone guide nutrients into the cells.
* burn calories much more quickly and efficiently than fat cells do.
* can contract to move parts of the body.
* contain a contractile mechanism that is activated by the action potential
  - long strands of protein lying next to each other
  - most of the structures common to all cells
  - several nuclei which lie on the periphery of the cell
  - the protein myoglobin which also requires oxygen to function
  - two very special chemicals called actin and myosin
* generate mechanical work from an energy liberating chemical reaction.
* have many nuclei and other intracellular organelles.
* have the ability to contract and relax like a spring
  - unique ability to contract, that is shorten
  - their own oxygen-binding molecule called myoglobin
* hold more water, becoming larger and better defined.
* is fibre
* lose some of their mitochondria, the cellular structures that produce energy.
* require calcium to generate contraction.
* respond by becoming larger and stronger, especially in the upper body.
* stay put, and so do the plasmids within.
* tend to be elongated and red in appearance.
* use more energy then fat cells
  - the energy to contract - the basis of all human activity
* work to move the rhino from place to place.
+ Muscle, Muscle Structure: Tissues

### cell | vegetative cell:

Muscle fiber
* All muscle fibers can make energy aerobically and anaerobically in varying degrees
  - contract to their greatest possible tension when stimulated
* Every muscle fiber is surrounded by a basement membrane.
* Muscle Fibers See fibroplasm.
* Some muscle fiber contains myofibril.
* Some muscle fiber is part of anuses
  - esophagi
  - eyes
  - fibers are normal in size and dark pink
* are also highly vascularized and innervated by nerves
  - composed of functional units called sarcomeres
  - covered by the endomysium
  - single large muscle cells
  - smooth, supple, organized, flexible, and have plenty of blood supply
* are the main cell type
  - tissues in our bodies that respond to exercise
* become locked in a state called rigor.
* can vary between individuals.
* change in several ways during development.
* consist mainly of water
  - of two main protein strands - actin and myosin
* contain creatine phosphate
  - many myofibrils , which are organized arrays of myofilaments
  - myofibrils, which in turn contain myofilaments
  - only nicotinic receptors
* develop from the fusion of many muscle precursor cells called myoblasts.
* have a hyaline appearance
  - variety of other specialized parts
  - contractile protein, mitochondrial protein, and other components
  - cytoplasmic vacuolation
  - only one type of neural activation, which causes a positive response
* make up the bulk of a muscle.
* send processes to nerve.
* show evidence of inflammation and changes similar to juvenile rheumatoid arthritis.
* signaling scales the myogenic stem cell pool.
* stretch, and the heart loses strength.
* tend to be long spaghetti like masses that contract.
* undergo necrosis and are ultimately replaced with adipose and connective tissue.
* work like molecular-scale linear motors.