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Which of the following neurotransmitters plays an excitatory role in neuromuscular transmission?

A.

GABA

B.

Glycine

C.

Acetylcholine

D.

Serotonin

Answer and Explanation

The Correct Answer is C

A. GABA (gamma-aminobutyric acid) is an inhibitory neurotransmitter in the central nervous system, meaning it generally reduces neuronal excitability and does not play a role in excitatory neuromuscular transmission.
B. Glycine is also an inhibitory neurotransmitter, mainly in the spinal cord, and works to prevent over-excitation of neurons, not directly involved in neuromuscular transmission.
C. Acetylcholine is the primary neurotransmitter responsible for neuromuscular transmission. It binds to receptors on muscle cells, causing depolarization and triggering muscle contraction, thus playing an excitatory role.
D. Serotonin primarily functions in the brain to regulate mood, appetite, and sleep but does not play a direct role in neuromuscular transmission.


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Related Questions

Correct Answer is A

Explanation

A. Intrinsic factor is a glycoprotein produced by the stomach that binds to vitamin B12 and facilitates its absorption in the small intestine, particularly in the ileum. This is the correct answer.

B. Bile salts are involved in the digestion and absorption of fats, not vitamin B12.

C. Pepsin is an enzyme in the stomach that aids in the digestion of proteins but is not involved in vitamin B12 absorption.

D. Amylase is an enzyme that helps break down carbohydrates, not involved in the absorption of vitamin B12.

Correct Answer is A

Explanation

A. The larynx, also known as the voice box, contains the vocal cords. The vocal cords vibrate to produce sound when air passes through them, allowing for speech and other vocalizations.
B. The pharynx is the passageway that connects the mouth and nose to the larynx and esophagus. It does not contain the vocal cords.
C. The trachea is the windpipe that conducts air to and from the lungs. It does not contain the vocal cords but is located just below the larynx.
D. The epiglottis is a flap of tissue that covers the opening of the larynx during swallowing to prevent food from entering the airway. It does not contain the vocal cords

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