A typical Thyroid Stimulation Hormone (or TSH) level is betw…

A typical Thyroid Stimulation Hormone (or TSH) level is between 0.5 and 5.0 m/U/I. TSH levels below 0.5 can indicate an overactive thyroid and a condition called hyperthyroidism. TSH levels above 5.0 can indicate an underactive thyroid and a condition called hypothyroidism. Both hyperthyroidism and hypothyroidism can cause medical challenges for patients and must be monitored, but the symptoms and treatments for the two conditions are different. Robert’s TSH level is 0.4. Decide if the patient is normal, has Hyperthyroidism, or has Hypothyroidism. 

A patient diagnosed with Guillain-Barré syndrome presents wi…

A patient diagnosed with Guillain-Barré syndrome presents with ascending weakness and decreased deep tendon reflexes. Nerve conduction studies show slowed signal transmission. Which of the following BEST explains the underlying pathophysiology affecting the peripheral nerves?