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Related Concept Videos

Factors Affecting Respiration01:24

Factors Affecting Respiration

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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:
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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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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 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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Hyperpnea and Hyperventilation01:25

Hyperpnea and Hyperventilation

3.7K
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...
3.7K
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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Related Experiment Video

Updated: Mar 25, 2026

Human Lung Dendritic Cells: Spatial Distribution and Phenotypic Identification in Endobronchial Biopsies Using Immunohistochemistry and Flow Cytometry
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Human Lung Dendritic Cells: Spatial Distribution and Phenotypic Identification in Endobronchial Biopsies Using Immunohistochemistry and Flow Cytometry

Published on: January 20, 2017

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Hypobaric hypoxia in 3000 m altitude leads to a significant decrease in circulating plasmacytoid dendritic cells in

Ilonka Rohm, Nicole Aderhold, Josephine Ratka

    Clinical Hemorheology and Microcirculation
    |February 19, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Hypobaric hypoxia significantly reduces circulating plasmacytoid dendritic cells (pDCs). Numbers recovered after returning to normoxia, indicating a reversible effect of high altitude on these immune cells.

    Keywords:
    Dendritic cellsaltitudehypobaric hypoxiainflammation

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    Human Lung Dendritic Cells: Spatial Distribution and Phenotypic Identification in Endobronchial Biopsies Using Immunohistochemistry and Flow Cytometry
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    Isolation of Mouse Lung Dendritic Cells
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    Area of Science:

    • Immunology
    • Altitude Physiology

    Background:

    • Hypoxia impacts the immune system, increasing pro-inflammatory cytokines and altering inflammatory cell counts.
    • Dendritic cells (DCs) are key antigen-presenting cells crucial for immune responses.

    Purpose of the Study:

    • To investigate the effect of hypoxia on circulating human dendritic cell subsets.
    • Specifically examining the impact of high altitude on plasmacytoid DCs.

    Main Methods:

    • Studied 17 healthy volunteers exposed to 3000m altitude.
    • Used Fluorescence-activated cell sorting (FACS) to quantify circulating DCs in normoxia and hypoxia.
    • Blood samples analyzed at baseline, during hypoxia, and after returning to normoxia (follow-up).

    Main Results:

    • High altitude exposure (3000m) significantly decreased oxygen saturation and increased breathing frequency.
    • A significant hypoxia-induced reduction in circulating plasmacytoid DCs (pDCs) was observed compared to baseline.
    • pDC levels significantly recovered during the follow-up period in normoxia.

    Conclusions:

    • Hypobaric hypoxia at high altitude causes a significant decrease in circulating pDCs.
    • The reduction in pDCs is reversible upon return to normoxic conditions.