2-Minute Neuroscience: Acetylcholine

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Release Date: 2024-04-03

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neurotransmitter
brain
choline
acetyl coenzyme A
synapse
nervous system

Video Introduction

This video is adapted from: https://youtu.be/6WFhhL-enlQ

Acetylcholine was the first neurotransmitter discovered, and is named for the two substances used to synthesize it: the nutrient choline and the enzyme acetyl coenzyme A.

Neurons that contain acetylcholine are called cholinergic. There are several clusters of cholinergic neurons throughout the brain. Some are found in the basal forebrain; they include the medial septal nucleus, the nucleus of the diagonal band, and the nucleus basalis. Others are found in the brainstem, including the pedunculopontine nucleus and laterodorsal tegmental nucleus.

Acetylcholine acts on two families of receptors, and each receptor family has several subtypes. One family is ionotropic; they are called nicotinic acetylcholine receptors because nicotine also binds to and activates the receptors. Their activation generally results in excitation of the neuron. Another family is metabotropic. These are called muscarinic acetylcholine receptors because a substance called muscarine binds to them; their effects depend on the subtype of the receptor.

The action of acetylcholine in the synapse is terminated by an enzyme called acetylcholinesterase, which breaks acetylcholine down into acetate and choline. The choline is then transported back into neurons to synthesize more acetylcholine.

Acetylcholine has a variety of functions in the nervous system. It is the main neurotransmitter used at neuromuscular junctions, and is responsible for muscle contraction. It is also widely used in the autonomic nervous system. Its functions in the brain are still not fully understood, but it does appear to play important roles in memory, arousal, and attention.^[1]^[2]

References

Kandel ER, Schwartz JH, Jessell TM 2000. Principles of Neural Science. 5th ed. New York. McGraw-Hill; 2013.
Purves D, Augustine GJ, Fitzpatrick D, Hall WC, Lamantia AS, McNamara JO, White LE. Neuroscience. 4th ed. Sunderland, MA. Sinauer Associates; 2008.

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Challenged, N. 2-Minute Neuroscience: Acetylcholine. Encyclopedia. Available online: https://encyclopedia.pub/video/video_detail/1170 (accessed on 21 December 2024).

Challenged N. 2-Minute Neuroscience: Acetylcholine. Encyclopedia. Available at: https://encyclopedia.pub/video/video_detail/1170. Accessed December 21, 2024.

Challenged, Neuroscientifically. "2-Minute Neuroscience: Acetylcholine" Encyclopedia, https://encyclopedia.pub/video/video_detail/1170 (accessed December 21, 2024).

Challenged, N. (2024, April 03). 2-Minute Neuroscience: Acetylcholine. In Encyclopedia. https://encyclopedia.pub/video/video_detail/1170

Challenged, Neuroscientifically. "2-Minute Neuroscience: Acetylcholine." Encyclopedia. Web. 03 April, 2024.