Question:
Neurotransmitters can be either excitatory or inhibitory, depending on where they are released, what receptors they bind to, and the ionic conditions that they encounter. Which of the following is a group of excitatory neurotransmitters?
Neurotransmitters can be either excitatory or inhibitory, depending on where they are released, what receptors they bind to, and the ionic conditions that they encounter. Which of the following is a group of excitatory neurotransmitters?
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- Glutamate = main excitatory
- GABA & Glycine = inhibitory
- Acetylcholine often excitatory
Updated On: May 13, 2026
- Glycine and Glutamate
- $\gamma$-aminobutyric acid (GABA) and Glycine
- Glutamate, Acetylcholine and Serotonin
- $\gamma$-aminobutyric acid (GABA) and Serotonin
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The Correct Option is C
Solution and Explanation
Concept:
Neurotransmitters are classified based on their effect:
• Excitatory → Increase likelihood of action potential
• Inhibitory → Decrease likelihood of action potential
Step 1: Identify inhibitory neurotransmitters.
• GABA → Major inhibitory neurotransmitter
• Glycine → Inhibitory neurotransmitter
Step 2: Identify excitatory neurotransmitters.
• Glutamate → Major excitatory neurotransmitter
• Acetylcholine → Often excitatory
• Serotonin → Generally excitatory/modulatory
Step 3: Analyze options.
• (A) Contains glycine → inhibitory → incorrect
• (B) Both inhibitory → incorrect
• (C) All excitatory → correct
• (D) Contains GABA → inhibitory → incorrect
Step 4: Final conclusion.
Thus, the correct group is: \[ Glutamate, Acetylcholine and Serotonin \]
• Excitatory → Increase likelihood of action potential
• Inhibitory → Decrease likelihood of action potential
Step 1: Identify inhibitory neurotransmitters.
• GABA → Major inhibitory neurotransmitter
• Glycine → Inhibitory neurotransmitter
Step 2: Identify excitatory neurotransmitters.
• Glutamate → Major excitatory neurotransmitter
• Acetylcholine → Often excitatory
• Serotonin → Generally excitatory/modulatory
Step 3: Analyze options.
• (A) Contains glycine → inhibitory → incorrect
• (B) Both inhibitory → incorrect
• (C) All excitatory → correct
• (D) Contains GABA → inhibitory → incorrect
Step 4: Final conclusion.
Thus, the correct group is: \[ Glutamate, Acetylcholine and Serotonin \]
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