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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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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%.
Types of Hypoxia
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Oxygen Requirements and Growth Patterns01:29

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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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Factors Affecting Respiration01:24

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Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
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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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Declining Oxygen Level as an Emerging Concern to Global Cities.

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Large cities face an emerging oxygen crisis, with urban areas consuming 39% of global terrestrial oxygen. High oxygen index (OI) correlates with heatwaves and water stress, risking hypoxia.

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Area of Science:

  • Environmental Science
  • Urban Ecology
  • Atmospheric Chemistry

Background:

  • Urban areas are known for rising CO2 and temperatures, but the potential for an oxygen crisis is understudied.
  • The oxygen balance in large cities is critical for urban sustainability and public health.

Purpose of the Study:

  • To investigate the oxygen balance and associated risks in 391 global large cities.
  • To analyze the oxygen index (OI) as a metric for urban oxygen consumption versus production.
  • To identify correlations between OI and urban environmental stressors.

Main Methods:

  • Analysis of oxygen balance using the oxygen index (OI) for 391 cities (population > 1 million).
  • Data collection and analysis for the period 2001-2015.
  • Statistical correlation of OI with heatwaves and water withdrawal data.

Main Results:

  • Urban areas account for 39% of global terrestrial oxygen consumption, despite occupying only 3.8% of land.
  • 75% of cities with over 5 million inhabitants have an OI > 100.
  • Higher OI values correlate with increased frequency of heatwaves and severe water withdrawals.

Conclusions:

  • Large cities exhibit a significant oxygen deficit, posing a risk of urban hypoxia, especially during calm weather.
  • Mitigation strategies to reduce urban OI are essential for developing healthier and sustainable cities.
  • The oxygen index (OI) serves as a key indicator for urban environmental health and sustainability.