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Contraction
A muscle fiber generates tension, causing the muscle to shorten.
Sarcomere
The functional and contractile units of skeletal and cardiac muscles; created by a specific arrangement of myofilaments called actin and myosin; each sarcomere is bordered by a z-line.
Calcium
A mineral necessary for the proper development and mineralization, as well as proper nerve and muscle function.
Sarcoplasmic Reticulum (SR)
A specialized form of smooth endoplasmic reticulum (SER) found within skeletal muscles used for calcium storage.
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