Aclient complains of rapid, involuntary movement of the eyes after a minor eye injury. a nurse assesses the client and finds that it is a disorder of the cranial nerves. which condition does the nurse suspect?

The condition probably called nystagmus. Nystagmus is a disease that will cause one of the eyeball movement is disrupted.
The cranial nerves that have the most role in eyeball movement are oculomotor (cranial III). But trochlear(cranial IV) and abducens(cranial VI) nerve have some role too. Without information about the specific direction of eye movement, you cant specify which of three nerve that got damaged.

Ican only answer your first question, a machine is like a human body because it's a little similar. they both almost work like the same.