Final answer:
Signs of an impaired nervous system include visual or hearing impairment, muscle weakness, impaired coordination and balance, numbness, and impaired cognitive function and memory.
Step-by-step explanation:
The signs that a patient's nervous system has become impaired include visual or hearing impairment, muscle weakness, impaired coordination and balance, numbness, and impaired cognitive function and memory. These signs indicate that there may be damage or dysfunction in the nervous system.