Answer: Inhibitory.
- A Excitatory
- B Inhibitory
- C Neither excitatory nor inhibitory
- D Only in peripheral nervous system
Correct answer: B. Inhibitory
Explanation: GABA (gamma-aminobutyric acid) is the main inhibitory neurotransmitter in the CNS. It reduces neuronal excitability.
Structure of a neuron. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.
Concept context
Brain, spinal cord, neurons, reflex arcs, and sense organs.