The possible energy sources for muscle contraction from the list include:
<h3>What is Energy?</h3>
This is referred to as the ability to do work and the major fuel in the body is referred to as glucose.
Glycogen in muscles also acts as a fuel although its synthesis is usually very slow.
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Explanation: I think camouflage method or a design that scares away predators.
A neuromuscular spindle is a spindle-shaped end organ in skeletal muscle. Afferent nerve fibers terminate and is sensitive to passive stretching of the muscle enclosing it.