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Related Concept Videos

Autonomic Nervous System01:22

Autonomic Nervous System

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The autonomic nervous system (ANS) is a critical component of the peripheral nervous system, primarily responsible for regulating involuntary bodily functions and maintaining homeostasis. It functions in tandem with the central nervous system (CNS) to seamlessly coordinate various physiological processes without the need for conscious control.
The ANS comprises two main divisions: the sympathetic and parasympathetic divisions. These divisions function antagonistically to maintain a dynamic...
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Autonomic Nervous System: Overview01:26

Autonomic Nervous System: Overview

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The human nervous system is divided into two main parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS is composed of the brain and spinal cord, while the PNS contains nerve cells, clusters of nerve cells, and the sensory receptors that are outside the CNS. The PNS has two types of nerve cells: sensory (afferent) and motor (efferent). Sensory cells send signals to the CNS from receptors, and motor cells carry signals from the CNS to organs, muscles, and...
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Disorders of the Autonomic Nervous System01:18

Disorders of the Autonomic Nervous System

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The autonomic nervous system (ANS) is an intricate network of nerves that controls functions such as the regulation of heart rate, digestion, and blood pressure regulation. When this system malfunctions, it can lead to various disorders that affect multiple bodily functions. One common feature of many autonomic disorders is the involvement of smooth blood vessels, which play a crucial role in regulating blood flow throughout the body.
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Drugs Acting on Autonomic Ganglia: Stimulants01:23

Drugs Acting on Autonomic Ganglia: Stimulants

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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...
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Drugs Acting on Autonomic Ganglia: Blockers01:28

Drugs Acting on Autonomic Ganglia: Blockers

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Ganglionic blockers inhibit autonomic activity by blocking nicotinic receptors in the autonomic ganglia, suppressing impulse transmission. These blockers lack selectivity between sympathetic and parasympathetic ganglia and are ineffective as neuromuscular junction antagonists. They can be categorized into two groups:
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Proton (¹H) NMR: Chemical Shift01:07

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Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
Absorption signals of all the protium nuclei...
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Related Experiment Video

Updated: Feb 6, 2026

Measuring Cardiac Autonomic Nervous System ANS Activity in Toddlers - Resting and Developmental Challenges
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Cardiac autonomic activity during simulated shift work.

Elena Skornyakov1,2, Shobhan Gaddameedhi1,3, Gemma M Paech1

  • 1Sleep and Performance Research Center, Washington State University, USA.

Industrial Health
|August 10, 2018
PubMed
Summary
This summary is machine-generated.

Shift work disrupts cardiac autonomic activity, impacting heart rate (HR) and heart rate variability (HRV). Displaced sleep and activity patterns significantly affect these markers, complicating their use in assessing cardiovascular disease risk in shift workers.

Keywords:
Circadian misalignmentHeart rate variabilityHuman sleepNight shiftParasympathetic nervous systemSympathetic nervous systemVagal tone

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Area of Science:

  • Cardiology
  • Chronobiology
  • Occupational Health

Background:

  • Shift work is linked to adverse cardiovascular outcomes.
  • Heart rate (HR) and heart rate variability (HRV) are key indicators of cardiac autonomic function and cardiovascular risk.
  • Understanding the specific impacts of shift work on HR and HRV is crucial for accurate health assessments.

Purpose of the Study:

  • To investigate the effects of simulated night work on cardiac autonomic activity, specifically HR and HRV.
  • To differentiate the impacts of circadian misalignment from sleep displacement and altered physical activity patterns on HR and HRV.

Main Methods:

  • Two in-laboratory studies involving simulated night work.
  • Continuous electrocardiogram (EKG) monitoring using Holter monitors.
  • Measurement of heart rate (HR) and the high-frequency component of HRV (HF-HRV).

Main Results:

  • Endogenous circadian rhythms were observed in both HR and HF-HRV.
  • Displaced sleep and physical activity during simulated night work had significant, opposing effects on HR and HF-HRV.
  • Complex interactions between time of day, sleep/wake state, and physical activity influence cardiac autonomic activity.

Conclusions:

  • Shift work's impact on cardiac autonomic activity is complex, involving interactions between circadian rhythms, sleep, and physical activity.
  • These interacting factors must be considered when interpreting HR and HRV in shift workers.
  • Accurate interpretation of HR and HRV is vital for assessing cardiovascular disease risk in this population.