8 26) According to the law of specific nerve energies, a single sensory receptor A) responds to only one type of stimulus, regardless of the strength of stimulation B) is coded for by the receptive field activated. C) responds best to a specific energy modality D) type detects all the somesthetic sensations E) type detects all the somatic sensations 27) Neurotransmitters are chemical signal molecules which are released to the synaptic cleft by presynaptic B) false 28) Which of the following changes in membrane potential is considered inhibitory? A) repolarization only neurons. A) true B) both hyperpolarization and depolarization C) both depolarization and repolarization D) hyperpolarization only E) depolarization only 29) Presynaptic inhibition allows an increased release of neurotransmitters. B) false A) true