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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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Oxygen Requirements and Growth Patterns01:29

Oxygen Requirements and Growth Patterns

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Microorganisms exhibit diverse oxygen requirements and growth patterns driven by their metabolic strategies and environmental adaptations. Oxygen, while essential for many organisms, can also be toxic under certain conditions, shaping how microorganisms grow and survive.Oxygen Requirements of MicroorganismsMicroorganisms are classified based on their ability to use or tolerate oxygen:● Obligate aerobes like Mycobacterium tuberculosis need oxygen for energy production, as it serves as the...
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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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Oxygen Transport in the Blood01:27

Oxygen Transport in the Blood

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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,...
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Regulation of Angiogenesis and Blood Supply01:24

Regulation of Angiogenesis and Blood Supply

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Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
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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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Related Experiment Video

Updated: Mar 8, 2026

Hypoxia Alters miRNAs Levels Involved in Non-Mendelian Inheritance of Autism Spectrum Disorder in Mice
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Hyperoxia and the Immature Brain.

Bettina Reich1, Daniela Hoeber, Ivo Bendix

  • 1Department of Paediatric Cardiology, Paediatric Heart Center, Justus Liebig University, Giessen, Germany.

Developmental Neuroscience
|February 3, 2017
PubMed
Summary
This summary is machine-generated.

Neonatal hyperoxia, or high oxygen levels, can harm the developing brain, leading to neurological impairments in preterm infants. Protective strategies are crucial during oxygen therapy to mitigate this brain injury.

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The Hypoxic Ischemic Encephalopathy Model of Perinatal Ischemia
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Area of Science:

  • Neonatology
  • Neuroscience
  • Developmental Biology

Background:

  • Preterm infants often experience neurological impairments despite advances in neonatal care.
  • Neonates have immature antioxidant systems, making them vulnerable to reactive oxygen species (ROS) and hyperoxia.
  • High oxygen concentrations can negatively impact lung and retinal development, contributing to bronchopulmonary dysplasia and retinopathy of prematurity.

Purpose of the Study:

  • To review the clinical and experimental evidence on hyperoxia's effects on the developing central nervous system (CNS).
  • To explore the pathophysiology of oxygen exposure-induced neonatal brain injury.
  • To discuss potential therapeutic strategies for mitigating hyperoxia-induced brain damage.

Main Methods:

  • Review of clinical studies and experimental research on neonatal hyperoxia and brain development.
  • Analysis of the mechanisms by which hyperoxia affects neuronal and glial cells.
  • Synthesis of current knowledge on oxygen's impact on neural plasticity and myelination.

Main Results:

  • Hyperoxia can cause neuronal and glial cell death, leading to white and grey matter injury in preterm infants.
  • Oxygen exposure during critical brain maturation disrupts neural plasticity and myelination processes.
  • Supraphysiological oxygen levels have deleterious effects on developing organs, including the brain, lung, and retina.

Conclusions:

  • Oxygen therapy is often necessary in neonatal intensive care but poses risks to the developing CNS.
  • Developing protective and regenerative strategies is essential to manage hyperoxia-induced neonatal brain injury.
  • Further research is needed to optimize oxygen therapy and protect vulnerable neonates from neurological damage.