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Related Concept Videos

Erythropoiesis01:14

Erythropoiesis

Red blood cells  (RBCs) transport oxygen to all body tissues. These cells survive only for 120 days and then need to be replenished. Erythropoiesis is the process of RBC production. In healthy individuals, erythropoiesis ensures all tissues are amply supplied with oxygen. In addition, blood loss due to injury leads to a drop in the physiological oxygen level that will cause erythropoiesis. Any defect in erythropoiesis leads to several physiological disorders, including thalassemia, anemia, and...
Structure and Function of Erythrocytes01:29

Structure and Function of Erythrocytes

There are between 4.2 and 6 million erythrocytes, also known as red blood cells, in every microliter of blood. These cells are small, flattened biconcave discs with centers that are depressed.
The erythrocyte plasma membrane is associated with proteins such as spectrin, which forms a flexible cytoplasmic meshwork. This meshwork allows erythrocytes to twist, turn, become cup-shaped, and regain their biconcave shape as they pass through narrow capillaries. Additionally, erythrocytes can form...
Lifecycle of Erythrocytes01:22

Lifecycle of Erythrocytes

Erythrocytes, also known as red blood cells, constantly move through blood capillaries. As a result, they damage their plasma membrane due to the continuous friction. Typically, after 100 to 120 days, erythrocytes become rigid and fragile as they wear out. As they pass through small vessels in the spleen and liver, they can get trapped and break apart into fragments.
The resident phagocytic macrophages deal with these damaged cells by engulfing them and separating their globin and heme groups.
Factors Affecting Erythropoiesis01:24

Factors Affecting Erythropoiesis

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.
Several factors influence the erythrocyte production rate, with tissue oxygen level being among the most critical. Intense exercise or high altitudes can cause tissue hypoxia, which triggers the kidneys to release more erythropoietin (EPO) into the bloodstream.
EPO then...
Disorders of Erythrocytes01:27

Disorders of Erythrocytes

Disorders of erythrocytes, or red blood cells (RBCs), include a range of conditions affecting their number, shape, or function.
Erythrocyte disorders can be broadly categorized into two main types: anemic and polycythemic conditions.
A low oxygen-carrying capacity of the blood due to the loss, lower production, or destruction of erythrocytes is termed anemia. Hemorrhagic anemia, for example, occurs when bleeding from an external wound or internal ulcer reduces erythrocyte counts.
On the other...
Microbial Biosensors01:17

Microbial Biosensors

Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...

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A Rapid and Chemical-free Hemoglobin Assay with Photothermal Angular Light Scattering
05:18

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Published on: December 7, 2016

Erythrocyte as a biological sensor.

J P Lopes de Almeida1, S Oliveira, C Saldanha

  • 1University of Lisbon Medical School, Santa Maria Hospital, Lisbon, Portugal.

Clinical Hemorheology and Microcirculation
|January 14, 2012
PubMed
Summary
This summary is machine-generated.

Erythrocytes are more than just hemoglobin sacs; they sense oxygen levels, influence blood flow, and detect inflammation. This review details their complex roles in microcirculation and erythrocyte death mechanisms.

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Area of Science:

  • Physiology
  • Microcirculation
  • Hematology

Background:

  • Erythrocytes (red blood cells) are traditionally viewed as simple oxygen carriers.
  • Emerging evidence suggests erythrocytes possess complex sensory and regulatory functions within the microcirculation.
  • Understanding these functions is crucial for comprehending physiological homeostasis and disease pathogenesis.

Purpose of the Study:

  • To review the multifaceted roles of erythrocytes as sensors in the microcirculation.
  • To explore the mechanisms underlying erythrocyte sensing of oxygen gradients and nitric oxide mobilization.
  • To discuss erythrocyte involvement in regulating blood viscosity, myogenic tone, and inflammatory responses.

Main Methods:

  • Comprehensive literature review of studies on erythrocyte physiology and microcirculation.
  • Analysis of research on hemoglobin conformation changes and nitric oxide dynamics.
  • Examination of factors influencing erythrocyte function, including vasoactive and oxidant/reductant molecules.

Main Results:

  • Erythrocytes actively sense local oxygen gradients via hemoglobin conformational changes.
  • Nitric oxide mobilization by erythrocytes significantly impacts vasomotor tone and microvascular இரத்த ஓட்டம் (blood flow).
  • Erythrocytes play roles in sensing tissue oxygen needs, blood viscosity, and inflammatory conditions.

Conclusions:

  • Erythrocytes are sophisticated cellular sensors, not merely passive carriers of hemoglobin.
  • Their functions extend to regulating microvascular tone, blood viscosity, and inflammatory status.
  • Revising the simplistic view of erythrocytes is essential for a deeper understanding of cardiovascular physiology and pathophysiology.