The terms extensibility, elasticity, irritability, and ability to develop tension describe which concept?

• A. Contractility
• B. Elasticity
• C. Neural properties
• D. Behavioral properties of muscles

Answer: (D)

These terms describe how muscle tissue behaves in response to being stretched, stimulated, and activated to produce force. Extensibility is the ability to be stretched beyond its resting length, while elasticity is the ability to return to the original length after being stretched. Irritability (often called excitability) is the muscle’s responsiveness to a stimulus, and the ability to develop tension refers to contractility—the force the muscle can generate when it shortens. Taken together, these properties explain how a muscle behaves under different conditions and demands. The most fitting overarching concept here is the behavioral properties of muscles, since it captures how muscles respond and function as a unit rather than isolating a single trait.