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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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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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Adaptive Mechanisms in Cancer Cells02:53

Adaptive Mechanisms in Cancer Cells

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Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
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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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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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Osmoregulation in Fishes02:32

Osmoregulation in Fishes

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When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
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Related Experiment Video

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Induction of Hypoxia in Living Frog and Zebrafish Embryos
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Sensing and surviving hypoxia in vertebrates.

Michael G Jonz1, Leslie T Buck2, Steve F Perry1

  • 1Department of Biology, University of Ottawa, Ottawa, Ontario, Canada.

Annals of the New York Academy of Sciences
|May 12, 2015
PubMed
Summary

Vertebrates face challenges surviving low oxygen (hypoxia). This review explores oxygen sensing, hypoxia adaptation, and anoxia tolerance mechanisms in nonmammalian species, highlighting fish and turtle models.

Keywords:
anoxiabrainchemoreceptorgilllung

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Area of Science:

  • Comparative Physiology
  • Environmental Adaptation
  • Vertebrate Biology

Background:

  • Hypoxia presents a critical survival challenge for vertebrates.
  • While many species sense and adapt to changing oxygen levels, few tolerate prolonged anoxia.
  • Nonmammalian vertebrates offer unique models for studying these adaptations.

Purpose of the Study:

  • To review recent research on oxygen sensing, hypoxia adaptation, and anoxia tolerance mechanisms.
  • To focus on adaptations in nonmammalian vertebrates.
  • To synthesize findings from various model organisms.

Main Methods:

  • Review of current scientific literature on hypoxia and anoxia tolerance.
  • Discussion of respiratory structures and chemosensory cells in fish.
  • Examination of genetic models like zebrafish for developmental insights.
  • Analysis of cellular adaptations in anoxia-tolerant species (goldfish, turtles).

Main Results:

  • Chemosensory neuroepithelial cells (NECs) in fish respiratory tissues initiate hypoxia-induced reflex responses.
  • Zebrafish models reveal the ontogeny of respiratory and chemosensory systems and potential intracellular O2 sensors.
  • Studies in goldfish and turtles uncover cellular adaptations, including neurotransmission regulation, for anoxia defense.

Conclusions:

  • Nonmammalian vertebrates exhibit diverse strategies for surviving hypoxic and anoxic conditions.
  • Understanding these mechanisms provides insights into fundamental physiological responses to oxygen availability.
  • Further research in these models can illuminate cellular defense strategies against oxygen deprivation.