Find b13, b31 and b43. 
Definitions:
Calcium Contraction
The process where calcium ions play a critical role in the contraction of muscle fibers, by binding to regulatory sites on the muscle filaments, making them active for contraction.
Skeletal Muscle
A type of muscle tissue that is attached to bones and is involved in the movement of the skeleton and posture maintenance.
Muscular System
The biological system consisting of skeletal, smooth, and cardiac muscles, enabling movement of the body and maintenance of vital functions.
Fascicle
A bundle of skeletal muscle fibers surrounded by connective tissue, forming part of a muscle.
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