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Factors Affecting Erythropoiesis01:24

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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.
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.
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The process of blood cell formation is called hematopoiesis. Hematopoiesis starts early during development, on the seventh day of embryogenesis. This phase of hematopoiesis is called the primitive wave, wherein the extraembryonic yolk sac allows the production of erythroid cells and endothelial cells from a common precursor called hemangioblast. The erythroid cells provide oxygen to support the growth of the rapidly dividing embryo. Hemangioblasts later develop into hematopoietic stem cells or...
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Overview of Hematopoiesis01:20

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Hematopoiesis, or blood cell production, is a vital biological process that begins early in embryonic development and continues throughout life. This process generates the various types of cells found in blood, including red blood cells, white blood cells, and platelets from hematopoietic stem cells (HSCs).
Developmental Phases of Hematopoiesis
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Multipotency of Hematopoietic Stem Cells01:19

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The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
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Disorders of Erythrocytes01:27

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Disorders of erythrocytes, or red blood cells (RBCs), include a range of conditions affecting their number, shape, or function.
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Regulation of Hematopoietic Stem Cells01:01

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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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Exploring the Effects of Spaceflight on Mouse Physiology using the Open Access NASA GeneLab Platform
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Alterations in hematologic indices during long-duration spaceflight.

Hawley Kunz1, Heather Quiriarte2, Richard J Simpson3

  • 1KBRwyle, 2400 NASA Parkway, Houston, TX 77058 USA.

BMC Hematology
|September 15, 2017
PubMed
Summary
This summary is machine-generated.

Astronauts in space do not develop anemia. Red blood cell and hemoglobin levels were elevated during long-duration spaceflight, indicating no persistent anemia.

Keywords:
AnemiaPlateletsRed blood cellsSpaceflight

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Area of Science:

  • Space medicine
  • Hematology
  • Astronaut health

Background:

  • Anemia is commonly perceived to be associated with spaceflight.
  • Hematologic assessment of red blood cell (RBC) indices has not been performed during long-duration space missions.

Purpose of the Study:

  • To assess RBC indices in astronauts during long-duration spaceflight.
  • To determine if astronauts develop anemia during space missions.

Main Methods:

  • Whole blood samples were collected from astronauts during up to 6-month orbital spaceflights.
  • Samples were stored at ambient temperature and returned to Earth for analysis within 48 hours.
  • Complete blood counts were performed, with a parallel stability study to assess the effect of sample delay.

Main Results:

  • Red blood cell and hemoglobin levels were significantly elevated during spaceflight.
  • These parameters remained stable despite the 48-hour delay in sample processing.
  • Hematocrit showed a greater increase in-flight than could be attributed to sample processing delay.

Conclusions:

  • Astronauts do not develop persistent anemia during spaceflight.
  • Elevated RBC and hemoglobin levels suggest adaptation rather than anemia.
  • Further research is needed to account for potential influences of dehydration or plasma volume alterations.