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Related Concept Videos

Factors Affecting Respiration01:24

Factors Affecting Respiration

Respiration is a crucial physiological function involving exchanging oxygen (O2) and carbon dioxide (CO2) between an organism and its environment. Various factors can impact this essential process:
Physiological Control of Respiration01:23

Physiological Control of Respiration

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...
Respiration and Gaseous Exchange01:20

Respiration and Gaseous Exchange

The intricate interplay between the cardiovascular and respiratory systems is crucial for efficiently transporting respiratory gases throughout the body. Let us explore the cardiovascular system's multifaceted functions, emphasizing its pivotal role in gas exchange.
Respiration involves the exchange of gases, especially oxygen (O2) and carbon dioxide (CO2), between the alveoli and body cells, a process facilitated by blood circulation. As a result, the cardiovascular system, which involves the...
Oxygen Transport in the Blood01:27

Oxygen Transport in the Blood

Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
Hypoxia01:23

Hypoxia

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...
Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

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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Related Experiment Video

Updated: Jul 25, 2026

Delivery of In Vivo Acute Intermittent Hypoxia in Neonatal Rodents to Prime Subventricular Zone-derived Neural Progenitor Cell Cultures
05:45

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

Published on: November 2, 2015

Mechanisms of hypoxemia.

N R Henig1, D J Pierson

  • 1Division of Pulmonary and Critical Care Medicine, Stanford University, Stanford, California 94305-5236, USA. nhenig@leland.stanford.edu

Respiratory Care Clinics of North America
|February 15, 2001
PubMed
Summary

This study reviews hypoxemia and hypoxia, detailing four primary causes of low blood oxygen and exploring tissue oxygen delivery. It proposes a diagnostic algorithm for hypoxia.

Area of Science:

  • Pulmonary Medicine
  • Physiology

Background:

  • Hypoxemia and hypoxia are critical physiological states impacting oxygen delivery.
  • Understanding pulmonary anatomy and oxygen transport is fundamental.

Observation:

  • Detailed examination of the four primary mechanisms of hypoxemia: low ambient oxygen, hypoventilation, ventilation-perfusion mismatch, and right-to-left shunt.
  • Inclusion of a fifth, rare mechanism of hypoxemia for comprehensive understanding.
  • Discussion of tissue hypoxia mechanisms when pulmonary oxygen exchange is adequate.

Findings:

  • Elucidation of the pathophysiological pathways leading to insufficient oxygen in the blood and tissues.
  • Presentation of patient examples to illustrate the clinical relevance of each hypoxemia mechanism.

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A Model to Simulate Clinically Relevant Hypoxia in Humans
09:54

A Model to Simulate Clinically Relevant Hypoxia in Humans

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Hypoxia Alters miRNAs Levels Involved in Non-Mendelian Inheritance of Autism Spectrum Disorder in Mice
09:13

Hypoxia Alters miRNAs Levels Involved in Non-Mendelian Inheritance of Autism Spectrum Disorder in Mice

Published on: July 11, 2025

Related Experiment Videos

Last Updated: Jul 25, 2026

Delivery of In Vivo Acute Intermittent Hypoxia in Neonatal Rodents to Prime Subventricular Zone-derived Neural Progenitor Cell Cultures
05:45

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

Published on: November 2, 2015

A Model to Simulate Clinically Relevant Hypoxia in Humans
09:54

A Model to Simulate Clinically Relevant Hypoxia in Humans

Published on: December 22, 2016

Hypoxia Alters miRNAs Levels Involved in Non-Mendelian Inheritance of Autism Spectrum Disorder in Mice
09:13

Hypoxia Alters miRNAs Levels Involved in Non-Mendelian Inheritance of Autism Spectrum Disorder in Mice

Published on: July 11, 2025

Implications:

  • Provides a structured approach to diagnosing patients presenting with hypoxia.
  • Enhances understanding of complex gas exchange abnormalities in respiratory medicine.
  • Aids clinicians in differentiating causes of hypoxemia and guiding appropriate management strategies.