Final answer:
Guillain-Barré syndrome causes ascending weakness in the patient, affecting mobility and potentially leading to paralysis.
Step-by-step explanation:
Guillain-Barré syndrome is a condition that affects mobility by causing ascending weakness in the patient. This means that the weakness starts in the lower body, such as the legs, and progresses upward towards the upper body. The weakness eventually leads to difficulty in moving and can result in complete paralysis.