(a) Explain the difference between an EPSP and an IPSP. (b) What specifically determines whether an EPSP or IPSP will be generated at the postsynaptic membrane? Since at any moment a neuron is likely...

(a) Explain the difference between an EPSP and an IPSP.

(b) What specifically determines whether an EPSP or IPSP will be generated at the postsynaptic membrane?

Since at any moment a neuron is likely to have thousands of neurons releasing neurotransmitters at its surface, how is neuronal activity (to fire or not to fire) determined?