Question

which of the following pathological conditions is due to an insufficient neurotransmitter at a synapse?
a guillain - barré syndrome
b multiple sclerosis
c myasthenia gravis
d shingles

Explanation:

Myasthenia gravis is an autoimmune disorder where antibodies block or destroy acetylcholine receptors at the neuromuscular junction (a type of synapse), leading to insufficient neurotransmitter (acetylcholine) - receptor interaction. Guillain - Barré syndrome is an autoimmune disorder that affects the peripheral nerves (damage to myelin). Multiple sclerosis is an autoimmune disorder that affects the central nervous system (damage to myelin in the brain and spinal cord). Shingles is a viral infection (reactivation of varicella - zoster virus) that affects nerves.

Answer:

C. myasthenia gravis