Answer: Excitatory (NMDA, AMPA receptor activation).
- 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.
Structure of a neuron. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.
Concept context
Brain, spinal cord, neurons, reflex arcs, and sense organs.