- A Inhibitory, hyperpolarizing postsynaptic neurons via GABA receptors
- B Excitatory (NMDA, AMPA receptor activation)
- C Modulatory mainly, acting through slow second-messenger pathways
- D Peripheral mainly, restricted to neuromuscular junctions
Correct answer: B. Excitatory (NMDA, AMPA receptor activation)
Explanation: Glutamate is the main excitatory neurotransmitter in the CNS. It activates NMDA and AMPA receptors and is critical for learning.
Concept context
Brain, spinal cord, neurons, reflex arcs, and sense organs.