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Related Concept Videos

Indirect-Acting Cholinergic Agonists: Pharmacological Actions01:30

Indirect-Acting Cholinergic Agonists: Pharmacological Actions

Indirect-acting cholinergic agonists, also known as anticholinesterases, exert their pharmacological effects by enhancing cholinergic transmission in various body parts, including the neuromuscular junction, autonomic cholinergic synapses, and the brain.
At the neuromuscular junction, these agents work by inhibiting the breakdown of acetylcholine, allowing it to remain bound to the receptor and bind to nearby receptors. This process leads to repetitive firing of the endplate, causing muscle...
Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
Direct-Acting Cholinergic Agonists: Pharmacological Actions00:59

Direct-Acting Cholinergic Agonists: Pharmacological Actions

Direct-acting cholinergic agonists exert their pharmacological actions by mimicking the effects of acetylcholine on postsynaptic muscarinic receptors to generate parasympathetic responses. These agents elicit a range of physiological responses, including cardiovascular effects. For example, activation of muscarinic receptors induces bradycardia, decreased cardiac output, reduced peripheral resistance, and consequent hypotension. In the eye, stimulation of M3 receptors leads to smooth muscle...
Cholinergic Receptors: Muscarinic01:25

Cholinergic Receptors: Muscarinic

The pharmacological actions of acetylcholine are elicited via its binding to two families of cholinergic receptors or cholinoceptors, namely, muscarinic and nicotinic receptors. Muscarinic receptors are G protein-coupled receptors and have five subtypes, M1–M5. All mAChR subtypes are activated by acetylcholine and blocked by the antagonist, atropine. 
The subtypes M1, M3, and M5 couple with the Gq subunit and activate the phospholipase C (PLC) activity, mobilizing intracellular Ca2+. Activation...
Parasympathetic Signaling01:30

Parasympathetic Signaling

Parasympathetic signaling plays a crucial role in regulating various physiological processes. It involves the release of acetylcholine (ACh) by parasympathetic neurons, which can have localized and short-lived effects. The majority of ACh released is rapidly inactivated at the synapse by the enzyme acetylcholinesterase (AChE), which hydrolyzes Ach into choline and acetate. Additionally, the tissue cholinesterase deactivates any ACh diffusing into the surrounding tissues.
The effects of...
Direct-Acting Cholinergic Agonists: Pharmacokinetics01:31

Direct-Acting Cholinergic Agonists: Pharmacokinetics

Direct-acting cholinergic agonists, such as synthetic choline esters and naturally occurring alkaloids, exert their effects by enhancing the actions of acetylcholine and stimulating the parasympathetic nervous system. Synthetic choline esters share structural similarities with acetylcholine. For example, they have a positively charged quaternary ammonium or onium group, contributing to their hydrophilic characteristics. As a result, they are poorly absorbed in the body through oral...

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Related Experiment Video

Updated: May 25, 2026

A Computerized Test Battery to Study Pharmacodynamic Effects on the Central Nervous System of Cholinergic Drugs in Early Phase Drug Development
07:02

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Published on: February 11, 2019

Cholinergic blockade and human information processing: are we asking the right questions?

J Rusted1

  • 1Laboratory of Experimental Psychology, University of Sussex, Falmer, Sussex BN1 9QG, UK.

Journal of Psychopharmacology (Oxford, England)
|February 3, 2012
PubMed
Summary

Cholinergic blockade impacts human information processing, affecting attention and memory. Re-evaluating drug studies using the resource model offers new insights into cognitive functions.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychopharmacology

Background:

  • Cholinergic blockade is studied for its effects on human information processing.
  • Current research debates the link between attention and memory deficits.
  • Existing psychopharmacological research relies on specific cognitive models.

Purpose of the Study:

  • To review literature on cholinergic blockade's effects on human information processing.
  • To explore neurochemical correlates of psychological function and cognitive models.
  • To re-evaluate drug studies using the resource model of information processing.

Main Methods:

  • Literature review of studies on cholinergic blockade and human information processing.
  • Analysis of cognitive psychology theories and their application in psychopharmacology.
  • Re-evaluation of drug studies through the lens of the resource model.

Main Results:

  • Cholinergic blockade influences attention and memory functions.
  • The resource model provides an alternative framework to modular dissociations.
  • Focus shifts to automaticity and resource availability in information processing.

Conclusions:

  • The resource model offers a valuable perspective for understanding drug effects on cognition.
  • Further research should integrate neurochemical findings with updated cognitive models.
  • Optimizing research tools and opportunities can enhance understanding of cognitive processes.