Compared with normals, the decrease in quantal size observed in familial infantile myasthenia would be most consistent with:

Compared with normals, the decrease in quantal size observed in familial infantile myasthenia would be most consistent with:

Compared with normals, the decrease in quantal size observed in familial infantile myasthenia would be most consistent with:






  1. fewer calcium channels in the presynaptic terminals.
  2. a greater rate of spontaneous exocytosis depleting the size of the vesicle pool.
  3. smaller synaptic vesicles.
  4. a change in the sensitivity of the calcium release mechanism.
  5. a loss of all ACh receptors at the neuromuscular junction.

Answer: 3