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Related Concept Videos

Hematopoiesis01:21

Hematopoiesis

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...
Overview of Hematopoiesis01:20

Overview of Hematopoiesis

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
Initially, HSCs are formed in the embryonic yolk sac, a critical site for early blood cell production. These stem cells subsequently migrate to other...
Lampbrush Chromosomes01:51

Lampbrush Chromosomes

In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...
Production of Formed Elements01:34

Production of Formed Elements

Hemangioblasts are multipotent stem cells originating from the mesoderm. They give rise to hematopoietic stem cells (HSCs), which undergo hematopoiesis to produce all the formed elements of blood. This process is regulated by a complex network of hematopoietic growth factors, including transcription factors, growth factors, and cytokines. These factors stimulate the HSCs to divide and differentiate, though some HSCs remain undifferentiated to maintain a self-renewing pool.
Most HSCs commit to...

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Reproductive Techniques for Ovarian Monitoring and Control in Amphibians
04:37

Reproductive Techniques for Ovarian Monitoring and Control in Amphibians

Published on: May 12, 2019

Amphibian hematology.

Matthew C Allender1, Michael M Fry

  • 1Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee, 2407 River Drive, Knoxville, TN 37996, USA. mattallender@utk.edu

The Veterinary Clinics of North America. Exotic Animal Practice
|August 5, 2008
PubMed
Summary
This summary is machine-generated.

Understanding amphibian hematology is crucial for assessing health. This article details blood collection, analysis, and interpretation for diverse amphibian species.

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Area of Science:

  • Veterinary Medicine
  • Comparative Hematology
  • Herpetology

Background:

  • Amphibians exhibit significant variability in normal hematologic parameters due to intrinsic and extrinsic factors.
  • Reference values for amphibian hematology are scarce, leading to a poor understanding of normal values for many species.
  • Challenges in amphibian hematology include nucleated blood cells and difficulties in obtaining adequate, uncontaminated blood samples.

Purpose of the Study:

  • To provide comprehensive guidelines for amphibian blood sample collection and handling.
  • To describe various hematologic tests and interpret their results in amphibians.
  • To detail amphibian hematopoiesis, cell morphology, function, and associated disorders.

Main Methods:

  • Review of existing literature on amphibian hematology.
  • Description of standard hematologic techniques adapted for amphibians.
  • Morphologic examination of amphibian blood cells.

Main Results:

  • Established guidelines for sample collection and handling to minimize contamination and ensure adequate volume.
  • Detailed descriptions of amphibian red blood cells, white blood cells, and thrombocytes, including morphology and function.
  • Discussion of factors influencing hematologic parameters and interpretation of results.

Conclusions:

  • Despite challenges, obtaining useful hematologic data from amphibians is feasible.
  • This information aids in assessing amphibian health, disease progression, and treatment response.
  • This article serves as a foundational resource for amphibian hematology.