_______________ is the major excitatory neurotransmitter in the brain.: (A) Ach, (B) Aspaate, (C) GABA, (D) Glutamate
Answer is D. Glutamate is the major excitatory neurotransmitter; 60% of brain synapses are glutamatergic. GABA is the major inhibitory neurotransmitter and can be localized by using glutamic acid decarboxylase as a marker. A delta fibers which carry sharp pricking pain also release Glutamate.