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Related Concept Videos

Respiratory Capacities01:24

Respiratory Capacities

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Respiratory capacities are crucial indicators of lung function, representing the maximum amount of air an individual's respiratory system can handle during various breathing phases.
One key metric is the Inspiratory Capacity (IC), which represents the maximum amount of air that can be inhaled with full effort. IC is calculated by summing the tidal volume and inspiratory reserve volume, typically ranging from 2.4 to 3.6 liters.
The Functional Residual Capacity (FRC) represents the air in the...
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Respiratory Volumes and Capacities I01:26

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Assessing the respiratory rate and rhythm for a complete minute is crucial for evaluating the breathing pattern. Even a minor increase in the patient's average respiratory rate, by as little as three to five breaths per minute, is an early and vital indicator of respiratory distress. Patients with a respiratory rate exceeding twenty-four breaths per minute require close monitoring to determine the physiological alterations. This careful observation is essential for prompt recognition and...
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Respiratory Volumes and Capacities01:22

Respiratory Volumes and Capacities

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The respiratory system is responsible for the intake of oxygen and the expulsion of carbon dioxide from the body. Respiratory volumes describe the volume of air in the lungs at different phases of the respiratory cycle. Tidal volume is the air breathed in and out during normal, quiet breathing. Inspiratory reserve volume is the air that can be forcefully inspired beyond the tidal volume. In contrast, expiratory reserve volume refers to the air that can be expelled from the lungs after a normal...
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Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

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Respiratory Depth
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
To assess respiratory depth, observe the degree of chest excursion or movement:
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Lung Capacity01:47

Lung Capacity

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The air in the lungs is measured in volumes and capacities. Lung volume measures reflect the amount of air taken in, released, or left over after a lung function, like a single inhalation. Lung capacity measures are sums of two or more lung volume measures.
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Brainstem01:19

Brainstem

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The brainstem, located inferior to the brain and superior to the spinal cord, serves as a bridge between the cerebrum and the spinal cord. It plays a vital role in relaying information and controlling critical life functions. It comprises three primary regions: the midbrain, pons, and medulla oblongata.
The Midbrain
The midbrain is located beneath the diencephalon and connects the cerebrum with the lower parts of the brain. The cerebral peduncles are prominent midbrain structures that house the...
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Electrophysiology on Isolated Brainstem-spinal Cord Preparations from Newborn Rodents Allows Neural Respiratory Network Output Recording
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Astrocytes modulate brainstem respiratory rhythm-generating circuits and determine exercise capacity.

Shahriar Sheikhbahaei1,2, Egor A Turovsky1,3, Patrick S Hosford1

  • 1Centre for Cardiovascular and Metabolic Neuroscience, Department of Neuroscience, Physiology and Pharmacology, University College London, London, WC1E 6BT, UK.

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Astrocytes in the brainstem control breathing. Disrupting astrocyte function impairs respiratory rate, responses to low oxygen and high carbon dioxide, and exercise capacity in rats.

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Area of Science:

  • Neuroscience
  • Glial Cell Biology
  • Respiratory Physiology

Background:

  • Astrocytes modulate neuronal excitability and synaptic function.
  • Their direct control over motor circuits and complex behaviors remains unclear.
  • The role of astrocytes in respiratory rhythm generation is not well understood.

Purpose of the Study:

  • To investigate if astrocytes in the preBötzinger complex (preBötC) directly control respiratory motor circuits.
  • To determine the impact of compromised astrocyte function on breathing and behavior in vivo.
  • To elucidate the role of astrocyte vesicular release in respiratory control.

Main Methods:

  • Viral vector-mediated disruption of vesicular release in preBötC astrocytes (dominant-negative SNARE or tetanus toxin light chain).
  • Assessment of breathing parameters (rate, rhythm variability, sighs) in conscious rats.
  • Evaluation of respiratory responses to hypoxia and hypercapnia.
  • Measurement of exercise capacity.

Main Results:

  • Blockade of astrocyte vesicular release in the preBötC reduced resting breathing rate and sigh frequency.
  • Compromised astrocytes decreased respiratory rhythm variability.
  • Impaired respiratory responses to hypoxia and hypercapnia were observed.
  • Exercise capacity was dramatically reduced following astrocyte dysfunction.

Conclusions:

  • Astrocytes critically modulate CNS circuits generating respiratory rhythm.
  • Astrocyte function is vital for adaptive respiratory responses during increased metabolic demand.
  • Astrocyte vesicular release mechanisms significantly determine exercise capacity.