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*Muscle "fiber" means a single cell, which are multi-nucleate, and known as '''syncitia'''
 
*Muscle "fiber" means a single cell, which are multi-nucleate, and known as '''syncitia'''
 
*Within each fiber are groups of parallel, longitudinal myofibrils
 
*Within each fiber are groups of parallel, longitudinal myofibrils
**Myofibrils are arranged as '''sarcomeres''', bound by Z-discs
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**Myofibrils are arranged as '''sarcomeres''', bound by Z-discs, which are the functional unit of muscle contraction
 
**Each sarcomere contains 2 separate groups of myofilaments:
 
**Each sarcomere contains 2 separate groups of myofilaments:
 
***Thin filament, containing '''Actin''', located centrally
 
***Thin filament, containing '''Actin''', located centrally
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