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Flashcards in Muscle Microanatomy Deck (3)
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Myofibril: Contractile Portion in Muscle Fiber

There are hundreds to thousands of myofibrils in each skeletal muscle fiber

Along the length of a myofibril, there are repeating segments called sarcomeres



Basic functional unit of skeletal muscle
--contraction of sarcomere is what contracts the muscle

A sarcomere extends from Z disk to Z disk

There can be as many as 10,000 sarcomeres per myofibril

The center of the sarcomere is the M line


Muscle Contraction

Sliding Filament Mechanism: the think and thick filament slide past each other