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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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Autoregulation of Blood Flow01:17

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Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
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Overview of Systemic and Pulmonary Circulation01:15

Overview of Systemic and Pulmonary Circulation

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The systemic and pulmonary circuits are crucial components of the circulatory system, working together to transport blood between the heart, lungs, and the rest of the body. The process begins with pulmonary circulation, where deoxygenated blood is pumped from the right ventricle to the lungs via the pulmonary trunk and arteries. Upon reaching the lungs, the blood becomes oxygenated and returns to the heart, specifically to the left atrium, via the pulmonary veins.
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Anatomy of the Circulatory System02:03

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The human circulatory system consists of blood, blood vessels that carry blood away from the heart, around the body, and back to the heart, and the heart itself, which acts as a central pump. The systemic circuit supplies blood to the whole body, the coronary circuit supplies blood to the heart, and the pulmonary circuit supplies blood flow between the heart and lungs.
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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 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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Related Experiment Video

Updated: May 2, 2026

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

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From macrocirculation to microcirculation and cellular oxygenation: a paradigm shift.

Marc-Olivier Fischer1

  • 1Institut Aquitain du Cœur, Clinique Saint-Augustin, Elsan, Bordeaux Cedex, France.

British Journal of Anaesthesia
|April 30, 2026
PubMed
Summary
This summary is machine-generated.

Tissue oxygenation in surgery is vital, but microcirculation and cellular levels are underused. Future research should focus on new technologies to monitor these aspects in high-risk patients.

Keywords:
cardiac outputcellular oxygenationcritical caremacrocirculationmean arterial pressuremicrocirculationoxygen deliveryperioperative physiologytissue oxygenation

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Area of Science:

  • Physiology
  • Critical Care Medicine
  • Surgical Patient Management

Background:

  • Patient blood management, haemostasis, and thrombosis are critical areas in surgical care.
  • Tissue oxygenation is a key physiological parameter in surgical patients, affecting outcomes.
  • Current clinical practice has advanced macrocirculatory management but lags in microcirculatory and cellular aspects.

Purpose of the Study:

  • To provide a narrative review on tissue oxygenation in surgical patients.
  • To examine the physiology, monitoring, and therapeutic optimization of tissue oxygenation.
  • To highlight the underutilization of microcirculatory and cellular oxygenation monitoring in routine care.

Main Methods:

  • A narrative review of existing literature was conducted by international experts.
  • The review synthesized information on macrocirculatory, microcirculatory, and cellular levels of oxygenation.
  • Focus was placed on physiological understanding, monitoring techniques, and therapeutic strategies.

Main Results:

  • Significant progress has been made in macrocirculatory management in surgical patients.
  • Microcirculation and cellular oxygenation remain underexplored and underutilized in clinical practice.
  • There is a need to integrate advanced monitoring for these levels into routine care.

Conclusions:

  • Optimizing tissue oxygenation requires attention beyond macrocirculation.
  • Emerging technologies for assessing microcirculation and cellular oxygenation are crucial.
  • Future research should prioritize these technologies for high-risk surgical and critically ill patients.