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Related Concept Videos

Oxygen Requirements and Growth Patterns01:29

Oxygen Requirements and Growth Patterns

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Microorganisms exhibit diverse oxygen requirements and growth patterns driven by their metabolic strategies and environmental adaptations. Oxygen, while essential for many organisms, can also be toxic under certain conditions, shaping how microorganisms grow and survive.Oxygen Requirements of MicroorganismsMicroorganisms are classified based on their ability to use or tolerate oxygen:● Obligate aerobes like Mycobacterium tuberculosis need oxygen for energy production, as it serves as the...
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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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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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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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The cardiovascular system regulates the number of erythrocytes in the bloodstream to ensure optimal oxygen transport. It also prevents over-proliferation of these cells, which helps to maintain blood viscosity and flow rate.
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Updated: Mar 14, 2026

Author Spotlight: Oxygen-Independent Assays to Measure Mitochondrial Function in Mammals
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Oxygen availability and metabolic adaptations.

Michael S Nakazawa1,2, Brian Keith1,2, M Celeste Simon1,3

  • 1Abramson Family Cancer Research Institute, Perelman School of Medicine, University of Pennsylvania.

Nature Reviews. Cancer
|September 24, 2016
PubMed
Summary

Hypoxia and nutrient scarcity in tumors drive significant gene expression and metabolic changes. This review details how hypoxic tumor cells adapt to these conditions, impacting disease progression.

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Area of Science:

  • Oncology
  • Cancer Biology
  • Tumor Microenvironment

Background:

  • Oxygen and nutrient levels fluctuate during tumor evolution.
  • Tumor microenvironments involve complex cellular and vascular interactions.
  • Hypoxia and nutrient scarcity are hallmarks of many tumors.

Purpose of the Study:

  • To review the adaptations of hypoxic tumor cells.
  • To understand the role of these adaptations in disease progression.

Main Methods:

  • Literature review of current understanding.
  • Synthesis of data on gene expression, signaling, metabolism, and stress responses.

Main Results:

  • Hypoxia and nutrient scarcity impact gene expression programs.
  • These conditions affect signaling pathways and metabolic reactions.
  • Cellular stress responses are altered in hypoxic tumor cells.

Conclusions:

  • Integrated adaptations in hypoxic tumor cells are crucial for tumor progression.
  • Understanding these adaptations offers insights into cancer treatment strategies.