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Related Concept Videos

Autonomic Nervous System01:22

Autonomic Nervous System

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...
Disorders of the Autonomic Nervous System01:18

Disorders of the Autonomic Nervous System

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.
Raynaud's disease, also known as Raynaud's phenomenon, is a...
Autonomic Nervous System: Overview01:26

Autonomic Nervous System: Overview

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...
Parasympathetic Division of the ANS01:08

Parasympathetic Division of the ANS

The parasympathetic division of the autonomic nervous system (ANS) regulates rest and digestion functions in the body. It works in opposition to the sympathetic division, promoting relaxation, conservation of energy, and digestion. The parasympathetic division consists of preganglionic fibers originating from specific cranial nerves (III, VII, IX, X) and the sacral spinal nerves (S2-S4). These fibers synapse with postganglionic neurons in the terminal ganglia, innervating various organs and...
Sympathetic Signaling01:31

Sympathetic Signaling

Sympathetic signaling, a vital part of the autonomic nervous system, plays a crucial role in mobilizing the body's resources in response to stress or emergencies. It involves the transmission of nerve impulses from sympathetic preganglionic fibers to postganglionic fibers. This results in the release of specific neurotransmitters and activation of adrenergic receptors.
Sympathetic preganglionic fibers release the neurotransmitter acetylcholine (ACh) onto the ganglionic neurons in the...
Neural Regulation01:37

Neural Regulation

Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.

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Related Experiment Video

Updated: Jun 23, 2026

Quantitative Autonomic Testing
11:40

Quantitative Autonomic Testing

Published on: July 19, 2011

Autonomic function and prognosis.

Michael S Lauer1

  • 1Director, Division of Prevention and Population Sciences, National Heart, Lung, and Blood Institute, 6701 Rockledge Drive, Rockledge Center II, Room 10021, Bethesda, MD 20892, USA. lauerm@nhlbi.nih.gov

Cleveland Clinic Journal of Medicine
|April 21, 2009
PubMed
Summary
This summary is machine-generated.

Assessing autonomic nervous system function through heart rate measures predicts cardiovascular risk and mortality. Understanding autonomic dysfunction correlates can improve patient outcomes.

Related Experiment Videos

Last Updated: Jun 23, 2026

Quantitative Autonomic Testing
11:40

Quantitative Autonomic Testing

Published on: July 19, 2011

Area of Science:

  • Physiology
  • Cardiology
  • Preventive Medicine

Background:

  • Autonomic nervous system (ANS) function is clinically evaluated using resting heart rate, heart rate variability (HRV), and heart rate recovery (HRR) post-exercise.
  • These heart rate metrics are established predictors of cardiovascular risk and all-cause mortality in both primary and secondary prevention contexts.

Purpose of the Study:

  • To review the clinical assessment of autonomic nervous system function via heart rate parameters.
  • To highlight the prognostic significance of ANS dysfunction in relation to cardiovascular health and mortality.
  • To identify patient-level and environmental factors associated with autonomic dysfunction.

Main Methods:

  • Review of clinical assessments of autonomic nervous system function.
  • Analysis of heart rate variability and heart rate recovery as prognostic indicators.
  • Identification of correlates of autonomic nervous system dysfunction.

Main Results:

  • Resting heart rate, HRV, and HRR are strong predictors of cardiovascular risk and mortality.
  • Autonomic dysfunction is associated with patient-specific factors like obesity, diabetes, and heart failure.
  • Environmental factors such as smoking, social stress, and air pollution also correlate with autonomic dysfunction.

Conclusions:

  • Autonomic nervous system dysfunction is linked to poor prognosis.
  • Further research is needed to leverage the association between ANS dysfunction and adverse outcomes.
  • Exploiting these associations holds potential for improving patient management and outcomes in cardiovascular disease.