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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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Hemoglobin01:24

Hemoglobin

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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.
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Chemical Factors Affecting Respiration Centers01:31

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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.
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Respiration and Gaseous Exchange01:20

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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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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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Gas Exchange and Transport01:20

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Gas exchange, the intake of molecular oxygen (O2) from the environment and the outflow of carbon dioxide (CO2) into the environment, is necessary for cellular function. Gas exchange during respiration occurs largely via the movement of gas molecules along pressure gradients. Gas travels from areas of higher partial pressure to areas of lower partial pressure. In mammals, gas exchange occurs in the alveoli of the lungs, which are adjacent to capillaries and share a membrane with them.
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Heme-based oxygen gasoreceptors.

Savani Anbalagan1

  • 1Institute of Molecular Biology and Biotechnology, Faculty of Biology, Adam Mickiewicz University, Poznań, Poland.

American Journal of Physiology. Endocrinology and Metabolism
|January 17, 2024
PubMed
Summary

Researchers propose identifying heme-based sensors as oxygen (O2) gasoreceptors. This broadens the search for O2 gasoreceptors across all organisms and cell types, advancing gasocrine signaling research.

Keywords:
gasocrinegasoreceptorglobin-coupled sensoroxygen

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Area of Science:

  • Physiology
  • Biochemistry
  • Molecular Biology

Background:

  • Gasocrine signaling relies on gasotransmitters like oxygen (O2).
  • Identifying specific gasoreceptors is crucial for understanding O2-mediated signaling pathways.
  • Current understanding of O2 sensing mechanisms is limited, particularly across diverse organisms.

Purpose of the Study:

  • To propose a framework for identifying and designating O2 gasoreceptors.
  • To advocate for a broader search strategy for O2 gasoreceptors beyond specialized tissues.
  • To facilitate a comprehensive understanding of gasocrine signaling.

Main Methods:

  • Literature review of existing scientific evidence on O2 sensing mechanisms.
  • Analysis of heme-based O2 sensors and their signaling domains.
  • Conceptual framework development for O2 gasoreceptor identification.

Main Results:

  • Heme-based O2 sensors with diverse signaling domains across genera are proposed as O2 gasoreceptors.
  • Acknowledging multiple protein classes for O2 gasoreceptors is essential for comprehensive discovery.
  • A systemic exploration approach will broaden the investigation across all organisms and cell types.

Conclusions:

  • Explicitly designating heme-based sensors as O2 gasoreceptors will advance gasocrine signaling research.
  • A diverse and inclusive search strategy is necessary to identify all O2 gasoreceptors.
  • This approach promises a more complete understanding of O2's role in cellular communication.