Which of the following acts as an inhibitory neurotransmitter in the brain?
Correct answer: D. GABA
- A. Acetylcholine
- B. Noradrenaline
- C. Dopamine
- D. GABA
Explanation
GABA, gamma aminobutyric acid, hyperpolarises the postsynaptic membrane and calms neural activity, and many sedatives enhance its action. Acetylcholine and noradrenaline are generally excitatory at the synapses where they are best known.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Receptors
Receptors are specialized cells or proteins that detect stimuli such as light, sound, pressure, temperature and chemicals, then initiate responses through sensory or hormonal pathways. Questions distinguish sensory receptors from effectors, compare receptor types, and examine stimulus conversion into nerve impulses, including the roles of rods, cones, chemoreceptors and mechanoreceptors.
Practise Coordination and Control
1,687 free Coordination and Control MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Receptors questions
In a single neuron, an impulse normally travels in the direction
The minimum strength of stimulus needed to generate an action potential in a neuron is called the
The gaps between successive Schwann cells along a myelinated axon are called
A dog that has learned to salivate at the sound of a bell whenever food is presented shows a
Blinking of the eyes when dust touches the cornea is an example of a
In a reflex arc, the motor neuron ends by stimulating an