Which term describes the muscle's ability to return to its original shape after contraction?

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Elasticity describes a muscle’s ability to return to its original shape after contraction. When a muscle contracts, elastic components within the muscle and its connective tissue store and then release energy so the muscle recoils back to its resting length. This recoil is what restores the muscle to its natural shape and tone between movements. The other terms describe different properties: irritability is responsiveness to stimuli, contractibility is the ability to shorten actively, and extensibility is the capacity to be stretched beyond resting length. Elasticity specifically captures the return to the original form after contraction, making it the correct term.