Which of the following is a property of muscles?

Muscles possess unique properties that enable them to function effectively within the body, and excitability is one of the primary characteristics. This property refers to a muscle's ability to respond to stimuli, such as signals from the nervous system. When a nerve impulse reaches a muscle fiber, it triggers a series of biochemical processes that lead to contraction. This responsiveness is crucial for movement, as it allows muscles to react promptly to various stimuli, whether voluntary movements or involuntary responses like reflexes.

The other terms listed do not accurately describe the properties of muscles. Portability is not relevant to muscle physiology, as it pertains more to the ability to be transported or moved. Stability generally refers to maintaining a position or state, which is more applicable to joints and frameworks within the body rather than the muscles themselves. Feasibility typically relates to practicality or the likelihood of achieving something, which does not pertain to the inherent biological functions of muscle tissue. Thus, excitability stands out as a defining property of muscles, playing a critical role in their ability to function.