Final answer:
The autoimmune disorder characterized by acute polyneuritis and profound myasthenia leading to potential paralysis is Guillain-Barré syndrome, which attacks the myelin sheaths of the peripheral nerves.
Step-by-step explanation:
An autoimmune disorder marked by acute polyneuritis, producing profound myasthenia that may lead to paralysis, is Guillain-Barré syndrome (GBS). This condition is characterized by the body's immune system mistakenly attacking the myelin sheaths that insulate the peripheral nerves, potentially resulting in weakness and paralysis. Unlike Multiple Sclerosis (MS), which affects the central nervous system, GBS predominantly impacts the peripheral nervous system. The sometimes life-threatening manifestations of Guillain-Barré syndrome can range from mild muscle weakness to severe paralysis and require immediate medical attention for proper management and treatment.