What characterizes neurodegenerative disorders?

Neurodegenerative disorders are primarily characterized by the progressive degeneration of the structure and function of the nervous system. This means that they involve a gradual deterioration of neurons, which are the essential cells responsible for transmitting information throughout the brain and the rest of the nervous system. The consequences of this degeneration can manifest in various neurological symptoms, including cognitive decline, movement disorders, and changes in behavior.

Conditions such as Alzheimer's disease, Parkinson's disease, and amyotrophic lateral sclerosis (ALS) exemplify neurodegenerative disorders, showing a clear pattern of worsening symptoms over time. This progression is a defining feature that distinguishes neurodegenerative disorders from other neurological issues, such as those mentioned in the other options. These other conditions may involve acute responses or reversible situations, whereas neurodegenerative disorders are marked by an irreversible decline in function.