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Related Concept Videos

Hypoxia01:23

Hypoxia

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Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
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Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

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Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
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Physiological Control of Respiration01:23

Physiological Control of Respiration

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Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
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Chemical Factors Affecting Respiration Centers01:31

Chemical Factors Affecting Respiration Centers

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Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
CO2 has a potent influence on respiration and is strictly regulated....
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Hyperpnea and Hyperventilation01:25

Hyperpnea and Hyperventilation

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Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...
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Respiratory Assessment: Purpose and Indications01:19

Respiratory Assessment: Purpose and Indications

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Respiratory assessment is a cornerstone of nursing assessments, crucial for the early detection of patient deterioration. This evaluation transcends routine procedures, representing a critical skill nurses must master to ensure optimal patient care.
Objectives and Importance:
The primary goal of respiratory assessment is to evaluate patients at early risk of clinical deterioration. Since respiratory distress often precedes other signs of declining health, breathing patterns and sounds become a...
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Related Experiment Video

Updated: Apr 5, 2026

Delivery of In Vivo Acute Intermittent Hypoxia in Neonatal Rodents to Prime Subventricular Zone-derived Neural Progenitor Cell Cultures
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Delivery of In Vivo Acute Intermittent Hypoxia in Neonatal Rodents to Prime Subventricular Zone-derived Neural Progenitor Cell Cultures

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Organismal Responses to Hypoxemic Challenges.

Robert S Fitzgerald1, Gholam A Dehghani, Samara Kiihl

  • 1Departments of Environmental Health Sciences, The Johns Hopkins University Medical Institutions, Baltimore, MD, 21205, USA, rfitzger@jhsph.edu.

Advances in Experimental Medicine and Biology
|August 26, 2015
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Summary

This study investigated how the body responds to low oxygen. Carotid bodies and aortic bodies, stimulated by hypoxia, trigger sympathetic nervous system responses to maintain blood pressure and organ perfusion.

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Area of Science:

  • Physiology
  • Neuroscience
  • Cardiovascular Research

Background:

  • The carotid bodies (CBs) and aortic bodies (ABs) are crucial chemoreceptors sensing oxygen levels.
  • While their sensing mechanisms are well-studied, organismal reflex responses remain less explored.

Purpose of the Study:

  • To investigate the systemic reflex responses to acute hypoxemia mediated by CBs and ABs in cats.
  • To differentiate the roles of CBs and ABs in regulating cardiovascular and organ vascular resistance during hypoxia.

Main Methods:

  • Cats were subjected to hypoxic hypoxia (HH) and carbon monoxide hypoxia (COH) to selectively stimulate CBs and ABs.
  • Whole animal responses (cardiac output, blood pressure) and regional vascular resistance (brain, heart, spleen, etc.) were recorded.
  • Aortic depressor nerves were sectioned to isolate the contribution of CBs.

Main Results:

  • Hypoxic hypoxia (HHint) effectively maintained perfusion pressures during systemic hypoxemia.
  • CBs mediated vasodilation in adrenals and eyes, while spleen and pancreas showed vasoconstriction.
  • Aortic bodies significantly influenced pulmonary vasculature and stomach blood flow.

Conclusions:

  • The sympathetic nervous system, activated by chemoreceptors, plays a primary role in the organism's hypoxemia response.
  • CBs and ABs exert differential effects on organ-specific vascular resistance.
  • This study highlights the integrated reflex control of circulation during hypoxic stress.