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Related Concept Videos

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,...
Special considerations while measuring oxygen saturation01:19

Special considerations while measuring oxygen saturation

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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Alterations in Respiration II01:30

Alterations in Respiration II

There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
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Hyperpnea and Hyperventilation01:25

Hyperpnea and Hyperventilation

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...
Chemical Factors Affecting Respiration Centers01:31

Chemical Factors Affecting Respiration Centers

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. Under...
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:

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Updated: May 15, 2026

Coherence between Brain Cortical Function and Neurocognitive Performance during Changed Gravity Conditions
12:29

Coherence between Brain Cortical Function and Neurocognitive Performance during Changed Gravity Conditions

Published on: May 23, 2011

Changes in cerebral oxygenation during parabolic flight.

Stefan Schneider1, Vera Abeln, Christopher D Askew

  • 1Institute of Movement and Neurosciences, German Sport University, Cologne, Am Sportpark Müngersdorf 6, 50933 Köln, Germany. schneider@dshs-koeln.de

European Journal of Applied Physiology
|January 22, 2013
PubMed
Summary

Altered gravity affects brain oxygenation. Microgravity increases brain oxygenation by boosting arterial flow, while hypergravity decreases it, impacting astronauts

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Area of Science:

  • Neuroscience
  • Space Physiology
  • Human Physiology

Background:

  • Understanding brain activity changes during altered gravity is crucial for space exploration.
  • Previous studies show gravity changes affect brain activity, but the underlying mechanisms remain unclear.

Purpose of the Study:

  • To investigate changes in brain oxygenation during altered gravity conditions.
  • To determine if blood volume redistribution explains neurocognitive alterations in microgravity and hypergravity.

Main Methods:

  • Near-infrared spectroscopy (NIRS) was used to measure oxygenized and deoxygenized hemoglobin.
  • Measurements were taken on the prefrontal cortex of nine subjects during parabolic flights.
  • Data collected across ten parabolas, encompassing hypergravity and microgravity phases.

Main Results:

  • Hypergravity led to a decrease in oxygenized hemoglobin (-1.44 μmol/l).
  • Microgravity resulted in a significant increase in oxygenized hemoglobin (up to 5.34 μmol/l).
  • Deoxygenized hemoglobin showed minor changes, suggesting altered cerebral blood flow dynamics.

Conclusions:

  • Altered gravity significantly impacts brain oxygenation and hemodynamics.
  • Observed changes indicate increased arterial blood flow and decreased venous outflow to the brain during microgravity.
  • Findings suggest blood flow redistribution is a key factor in brain function under altered gravity.