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Contractility
Contractility Con`trac*til"i*ty, n.
1. The quality or property by which bodies shrink or
contract.
2. (Physiol.) The power possessed by the fibers of living
muscle of contracting or shortening.
Note: When subject to the will, as in the muscles of
locomotion, such power is called voluntary
contractility; when not controlled by the will, as in
the muscles of the heart, it is involuntary
contractility.
Meaning of Contractility from wikipedia