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Related Concept Videos

Diffusion01:12

Diffusion

Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
Gas Exchange and Transport01:20

Gas Exchange and Transport

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.
Types of Signaling Molecules01:32

Types of Signaling Molecules

In multicellular organisms, many molecules transmit signals between cells to pass information. These signals vary in complexity and include small peptides, nucleotides, steroids, fatty acid derivatives, and dissolved gases such as nitric oxide. Some signaling molecules diffuse through the plasma membrane to act locally between neighboring cells or travel long distances. Others remain attached to the cell surface, transmitting information to other cells only when they make contact. In some...
Diffusion01:21

Diffusion

Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
Types of Signaling Molecules01:32

Types of Signaling Molecules

In multicellular organisms, many molecules transmit signals between cells to pass information. These signals vary in complexity and include small peptides, nucleotides, steroids, fatty acid derivatives, and dissolved gases such as nitric oxide. Some signaling molecules diffuse through the plasma membrane to act locally between neighboring cells or travel long distances. Others remain attached to the cell surface, transmitting information to other cells only when they make contact. In some...
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...

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Related Experiment Video

Updated: Jun 29, 2026

Quantitative and Temporal Control of Oxygen Microenvironment at the Single Islet Level
11:49

Quantitative and Temporal Control of Oxygen Microenvironment at the Single Islet Level

Published on: November 17, 2013

Signal transduction. How do cells sense oxygen?

H Zhu1, H F Bunn

  • 1Hematology Division of the Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA. zhu@calvin.bwh.harvard.edu

Science (New York, N.Y.)
|April 9, 2001
PubMed
Summary
This summary is machine-generated.

Organisms sense low oxygen levels (hypoxia) through the HIF transcription factor. New findings show oxygen levels directly regulate HIF, controlling the body's hypoxia response proteins.

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Last Updated: Jun 29, 2026

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Published on: November 17, 2013

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Area of Science:

  • Cellular Biology
  • Physiology
  • Molecular Biology

Background:

  • Organisms must adapt to changing oxygen levels.
  • Hypoxia, or low oxygen, triggers specific cellular responses.
  • The hypoxia-inducible factor (HIF) pathway is central to these responses.

Purpose of the Study:

  • To explain how organisms sense oxygen levels.
  • To discuss the regulation of the HIF transcription factor.
  • To highlight new findings on oxygen tension's role in hypoxia response.

Main Methods:

  • Review of recent research findings.
  • Analysis of regulatory mechanisms for HIF.
  • Discussion of protein activation in hypoxia.

Main Results:

  • The HIF transcription factor is a key regulator of hypoxia-response proteins.
  • Oxygen tension directly influences the regulation of HIF.
  • New insights into the sensing mechanisms of cellular oxygen.

Conclusions:

  • Understanding HIF regulation is crucial for comprehending hypoxia adaptation.
  • These findings advance our knowledge of oxygen homeostasis.
  • Further research into HIF pathways may yield therapeutic targets.