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Related Concept Videos

Drugs Acting on Autonomic Ganglia: Stimulants01:23

Drugs Acting on Autonomic Ganglia: Stimulants


Ganglionic stimulants activate NM nicotinic receptors in autonomic ganglia, falling into two categories: nicotine mimetics [e.g., lobeline, dimethylpiperazine, tetramethylammonium] and muscarinic receptor agonists [e.g., muscarine, methacholine]. The first category's action is rapid and blocked by nicotinic receptor antagonists, while the second category's action is delayed and blocked by atropine-like agents. Nicotine, an alkaloid, affects the heart rate by stimulating sympathetic or...
CNS Depressants: Alcohol and Nicotine01:27

CNS Depressants: Alcohol and Nicotine

Ethanol, a clear colorless alcohol, has been consumed by humans for millennia, but its effects on the body are far from benign. At lower doses, it induces decreased inhibitions and loquaciousness, leading to its social appeal. However, it can cause severe consequences at higher doses, such as coma and respiratory depression, due to its zero-order elimination kinetics. Chronic ethanol abuse wreaks havoc on multiple organ systems, particularly the CNS and the liver. Abrupt cessation of ethanol...
Cholinergic Receptors: Nicotinic01:15

Cholinergic Receptors: Nicotinic

Nicotinic receptors are ligand-gated ion channels that are activated by acetylcholine and nicotine. Upon activation, they cause a rapid increase in the permeability of cells to K+, Na+, and Ca2+, followed by depolarization and excitation. They are in the autonomic ganglia, skeletal neuromuscular junction, CNS, and adrenal medulla.
There are two types of nicotinic receptors: neuromuscular (NM/NM/N1) and neuronal (NN/NN/N2). The two families differ based on their location and selectivity to...
The Resting Membrane Potential01:21

The Resting Membrane Potential

Overview
Resting Membrane Potential01:24

Resting Membrane Potential

The relative difference in electrical charge, or voltage, between the inside and the outside of a cell membrane, is called the membrane potential. It is generated by differences in permeability of the membrane to various ions and the concentrations of these ions across the membrane.
The Inside of a Neuron is More Negative
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Resting Potential Decay

The resting membrane potential of a neuron (-70mV) is sustained due to the selective ion permeability of the membrane. At the resting potential, the membrane is slightly permeable to ions like sodium (Na+) and chloride (Cl−) and highly permeable to potassium ions (K+). Differences in the ions' concentration inside the cell compared to the outside are maintained by membrane transport proteins like channels and pumps.
At rest, the K+ is the main ion that moves across the membrane through...

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Related Experiment Video

Updated: Jun 4, 2026

Local Application of Drugs to Study Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices
10:04

Local Application of Drugs to Study Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices

Published on: October 29, 2012

Nicotine effects on default mode network during resting state.

Jody Tanabe1, Eric Nyberg, Laura F Martin

  • 1Department of Radiology, University of Colorado Denver School of Medicine, Denver, CO, USA. jody.tanabe@ucdenver.edu

Psychopharmacology
|February 19, 2011
PubMed
Summary
This summary is machine-generated.

Nicotine reduces activity in the brain's default mode network (DMN) and boosts activity in visual attention networks, even without external tasks. This suggests nicotine may shift brain focus from internal to external processing.

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Live Imaging of Nicotine Induced Calcium Signaling and Neurotransmitter Release Along Ventral Hippocampal Axons
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Live Imaging of Nicotine Induced Calcium Signaling and Neurotransmitter Release Along Ventral Hippocampal Axons

Published on: June 24, 2015

Related Experiment Videos

Last Updated: Jun 4, 2026

Local Application of Drugs to Study Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices
10:04

Local Application of Drugs to Study Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices

Published on: October 29, 2012

Live Imaging of Nicotine Induced Calcium Signaling and Neurotransmitter Release Along Ventral Hippocampal Axons
12:19

Live Imaging of Nicotine Induced Calcium Signaling and Neurotransmitter Release Along Ventral Hippocampal Axons

Published on: June 24, 2015

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Pharmacology

Background:

  • The default mode network (DMN) is crucial for self-referential thought and memory.
  • Nicotine enhances cognitive functions, particularly attention.
  • Previous research indicates nicotine alters brain activity during demanding tasks, but its effects at rest are unclear.

Purpose of the Study:

  • To investigate nicotine's impact on resting-state brain networks.
  • To determine if nicotine suppresses the DMN and enhances visual attention networks without external stimuli.

Main Methods:

  • A within-subject, single-blinded study involving 19 non-smoking participants.
  • Resting-state functional MRI scans were acquired after administering a 7 mg nicotine patch or placebo.
  • Group independent component analysis and statistical parametric mapping were used to analyze brain activity.

Main Results:

  • Nicotine administration was linked to reduced activity within the DMN.
  • Increased activity was observed in extra-striate resting-state networks associated with visual attention.

Conclusions:

  • Nicotine appears to suppress the DMN and enhance visual attention networks at rest.
  • These findings suggest nicotine may facilitate a shift from internal to external information processing.
  • This mechanism could explain nicotine's cognitive benefits and potential therapeutic applications for neurological disorders.