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Related Concept Videos

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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Hypoxia01:23

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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%.
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Special considerations while measuring oxygen saturation01:19

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Assessing respiratory rate concurrently with pulse measurement is fundamental to patient care, providing valuable insights into the patient's respiratory function. The normal breathing rate for an adult usually falls within a normal range of 12 to 20 breaths per minute. Abnormal respiratory rates can signal underlying health conditions or the need for immediate intervention.
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Hemoglobin01:24

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Hemoglobin is a globular protein made up of four subunits. Two of these subunits are alpha chains, and the other two are beta chains. Each subunit contains a molecule of heme, which has an iron atom and can bind to oxygen. When an oxygen molecule binds to one heme group, it changes the shape of hemoglobin, making it easier for the other heme groups to bind oxygen as well.
When all four heme groups are bound to oxygen, the resulting molecule is called oxyhemoglobin. As a result, arterial blood...
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Respiration and Gaseous Exchange01:20

Respiration and Gaseous Exchange

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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.
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Factors Affecting Respiration01:24

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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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Updated: Mar 1, 2026

A Model to Simulate Clinically Relevant Hypoxia in Humans
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A Model to Simulate Clinically Relevant Hypoxia in Humans

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Hemoglobin Oxygen Saturation with Mild Hypoxia and Microgravity.

Johnny Conkin, James H Wessel, Jason R Norcross

    Aerospace Medicine and Human Performance
    |May 26, 2017
    PubMed
    Summary

    Microgravity exposure and recovery do not alter astronaut hemoglobin oxygen saturation during mild hypoxic challenges. This study found no significant changes in oxygen saturation levels in astronauts tested in space and after returning to Earth.

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    Area of Science:

    • Aerospace Medicine
    • Human Physiology
    • Space Exploration

    Background:

    • Microgravity (μG) exposure and early recovery can increase the alveolar-arterial oxygen partial pressure gradient.
    • This physiological change may impact oxygen saturation under hypoxic conditions.

    Purpose of the Study:

    • To investigate the effect of microgravity and recovery on astronaut hemoglobin oxygen saturation (SpO2) during hypoxic challenges.
    • To assess if physiological changes in space affect the body's ability to maintain oxygen saturation.

    Main Methods:

    • Four astronauts on two Space Shuttle missions (STS-69 and STS-72) underwent sequential hypoxic challenges.
    • Inspired oxygen partial pressure (PiO2) was reduced by breathing progressively lower oxygen-nitrogen mixtures.
    • Hemoglobin oxygen saturation (SpO2) was measured using finger pulse oximetry, both in-flight and on Earth (R+0 and R+2 days post-flight).

    Main Results:

    • Astronaut SpO2 levels remained stable at approximately 97% during a PiO2 of 127 mmHg, both in-flight and during terrestrial testing.
    • No significant differences in SpO2 were observed between in-flight measurements and post-flight assessments (R+0, R+2) under hypoxic conditions.

    Conclusions:

    • Physiological adaptations to microgravity and the recovery process did not impair astronaut SpO2 response to mild hypoxia.
    • Astronauts maintain stable hemoglobin oxygen saturation despite microgravity exposure and early recovery phases.