select all that apply choose all that would cause postsynaptic stimulation to end. multiple select question. reuptake of neurotransmitter into the presynaptic knob enzymatic degradation of neurotransmitter in the synaptic cleft addition of receptors onto presynaptic membrane cessation of signals in the presynaptic nerve fiber diffusion of neurotransmitter from the synaptic cleft into extracellular fluid