What is the function of GABA?

What is the function of GABA?

• A. Most prevalent inhibitory neurotransmitter in CNS neurons
• B. Primary excitatory neurotransmitter in CNS
• C. Modulates dream sleep
• D. Neurotrophic factor

Answer: (A)

GABA’s job is to keep brain activity in check by inhibiting neuronal firing. It does this through two main receptor types: GABA_A, which opens chloride channels to hyperpolarize the neuron and make it harder to reach an action potential, and GABA_B, which activates pathways that reduce excitability over a longer time by influencing potassium and calcium channels. This inhibitory control is why GABA is the most prevalent inhibitory neurotransmitter in the central nervous system and is essential for balancing excitation, reducing anxiety, and helping prevent seizures. It isn’t the primary excitatory transmitter—that role belongs to glutamate. It isn’t a neurotrophic factor like BDNF or NGF, which support neuron growth and survival rather than fast synaptic transmission. While GABAergic activity can influence sleep and dreaming, its defining function is to dampen neural activity rather than specifically modulating dream sleep.

GABA’s job is to keep brain activity in check by inhibiting neuronal firing. It does this through two main receptor types: GABA_A, which opens chloride channels to hyperpolarize the neuron and make it harder to reach an action potential, and GABA_B, which activates pathways that reduce excitability over a longer time by influencing potassium and calcium channels. This inhibitory control is why GABA is the most prevalent inhibitory neurotransmitter in the central nervous system and is essential for balancing excitation, reducing anxiety, and helping prevent seizures. It isn’t the primary excitatory transmitter—that role belongs to glutamate. It isn’t a neurotrophic factor like BDNF or NGF, which support neuron growth and survival rather than fast synaptic transmission. While GABAergic activity can influence sleep and dreaming, its defining function is to dampen neural activity rather than specifically modulating dream sleep.