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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.
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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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The nervous system, responsible for sensing, integrating, and responding to various stimuli, is divided into the central nervous system (CNS) and the peripheral nervous system (PNS). The PNS has two functional divisions: the sensory or afferent division and the motor or efferent division.
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The nervous system coordinates body functions through its complex network of nerve cells, enabling sensation and movement. It is divided into two primary parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS is composed of the brain and the spinal cord. The brain acts as the body's control center, processing sensory information and coordinating responses. The spinal cord functions as a major signaling pathway for the brain and the rest of the body.
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An introduction into autonomic nervous function.

John M Karemaker1

  • 1Department of Anatomy, Embryology and Physiology, Academic Medical Center at the University of Amsterdam, Amsterdam, Netherlands.

Physiological Measurement
|March 18, 2017
PubMed
Summary
This summary is machine-generated.

Autonomic nervous system (ANS) variability influences medical measurements. This review explains ANS physiology, including its branches, functions in organs like the eye and heart, and its top-down versus bottom-up control, highlighting variability as integral to its operation.

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Area of Science:

  • Physiology
  • Neuroscience
  • Medical Measurement

Background:

  • Autonomic nervous system (ANS) significantly impacts medical measurements, causing variability in pupil size and heart rate.
  • Understanding ANS physiology is crucial for interpreting physiological data and understanding health and disease states.

Purpose of the Study:

  • To elucidate the physiology of the autonomic nervous system (ANS).
  • To explore the structure, function, and control mechanisms of the ANS.
  • To contextualize ANS variability within medical measurements.

Main Methods:

  • Review of existing literature on autonomic nervous system (ANS) physiology.
  • Detailed examination of ANS function in specific organs (eye, heart, lungs, etc.).
  • Discussion of ANS control mechanisms (top-down vs. bottom-up).

Main Results:

  • The peripheral ANS involves parallel sympathetic and parasympathetic innervation with distinct transmitters.
  • ANS functions are explored in organs, including the eye, heart, lungs, and their coupling.
  • The review discusses the top-down versus bottom-up control of the ANS, suggesting a complex interplay.

Conclusions:

  • Autonomic nervous system (ANS) variability, often seen as 'noisy numbers,' is an inherent and functional aspect of the system.
  • Understanding ANS physiology is key to interpreting medical measurements accurately.
  • The review aims to stimulate discussion and further research into ANS mechanisms.