CONTRACTIBILITY is the characteristic that describes what is happening to chest and shoulder muscles when a gymnast performs a headstand (Option A).
- Contractility refers to the ability of muscles fibers to forcefully shorten into a more compact form.
- For instance, when flexing the elbow, it is necessary to contract elbow flexor muscles (e.g., the biceps brachii) in the anterior arm.
- Elasticity refers to the ability of muscle fibers to return to their original shape after a deforming force.
- Excitability refers to the ability of the muscle fibers to respond to a stimulus.
- Extensibility refers to the ability of the muscle fibers to extend to a predetermined endpoint.
In conclusion, CONTRACTIBILITY is the characteristic that describes what is happening to chest and shoulder muscles when a gymnast performs a headstand (Option A is correct).
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