What is a Miniature End-Plate Potential (MEPP)? Select All That

Question

What is a miniature end-plate potential (mEPP)? Select all that apply.
A) The change in postsynaptic potential at a very small muscle
B) Spontaneous postsynaptic responses in the absence of a presynaptic action potential
C) Small postsynaptic responses of a unitary size, or multiples of that size
D) The change in postsynaptic potential to a very small action potential

Accepted Answer

(a) is not correct as you can have mEPPs in all muscles, not just small ones. (d) is not correct as action potentials, in general, are consistent in their amplitude. Both (b) and (c) are correct. mEPPs are small, discrete postsynaptic responses to multiple packets of neurotransmitters released from vesicles.