blood islands

(noun)

Structures in the developing embryo that lead to many different parts of the circulatory system.

Related Terms

  • hematopoeisis
  • hemangioblast

Examples of blood islands in the following topics:

  • Development of Blood

    • Commonly known as white blood cells, they are derived from common lymphoid progenitors.
    • In developing embryos, blood formation occurs in aggregates of blood cells in the yolk sac, called blood islands.
    • For the stem cells and other undifferentiated blood cells in the bone marrow, blood cells are determined to specific cell types at random.
    • Blood islands form in the yolk sac of an embryo by cellular differentiation of hemangioblasts into endothelial cells.
    • Next, the capillary plexus forms as endothelial cells migrate outward from blood islands and form a random network of continuous strands.
  • WBC Formation

    • Haematopoiesis refers to the formation of blood cells components.
    • Haematopoiesis refers to the formation of blood cellular components, including both white and red blood cells.
    • All cellular blood components are derived from haematopoietic stem cells located within the bone marrow.
    • In developing embryos, blood formation occurs in aggregates of blood cells in the yolk sac called blood islands.
    • However, most of blood supply comes from the mother through the placenta.
  • Development of Blood and Blood Vessels

    • As part of the circulatory system, blood vessels play a critical role in transporting blood throughout the body.
    • Formation of new blood vessels occurs by two different processes: vasculogenesis and angiogenesis.
    • The latter occurs when new vessels are built from preexisting blood vessels.
    • In the yolk sac's blood islands, HPCs and EC lineages emerge from the extraembryonic mesoderm in near unison.
    • In 1917, Florence Sabin first observed that the development of blood vessels and red blood cells in the yolk sac of chick embryos occur in close proximity and time.
  • Overview of Pancreatic Islets

    • The pancreatic islets are small islands of cells that produce hormones that regulate blood glucose levels.
    • Hormones produced in the pancreatic islets are secreted directly into the blood flow by five different types of cells.
    • Glucagon is a hormone that raises blood glucose levels by stimulating the liver to convert its glycogen into glucose.
    • Insulin lowers blood glucose levels by stimulating cells to take up glucose out of the blood stream.
    • Amylin slows gastric emptying, preventing spikes in blood glucose levels.
  • Types of Cells in the Pancreas

    • The pancreatic islets are small islands of cells that produce hormones that regulate blood glucose levels.
    • Hormones produced in the pancreatic islets are secreted directly into the blood flow by five different types of cells.
    • Glucagon is a hormone that raises blood glucose levels by stimulating the liver to convert its glycogen into glucose.
    • Insulin lowers blood glucose levels by stimulating cells to take up glucose out of the blood stream.
    • Amylin slows gastric emptying, preventing spikes in blood glucose levels.
  • Barrier Islands

  • Repeating Key Terms and Phrases

    • After all, he is not attempting to move out of his place in the hierarchy of the island. "
    • "But upon close examination those intricacies of form are even more suggestive of a problem in the island hierarchy than the content of Caliban's speech is."
    • By repeating "island hierarchy," the writer reminds the reader of the main focus of the paper, even when each paragraph examines that focus (the island hierarchy) in a different way.
    • The study shows that too much sodium can lead to an increased blood pressure.
    • The study finds that as Sodium increases blood pressure this excess strain on the heart can double the risk of heart attack.
  • Crafts in the Cook Islands

    • British navigator Captain James Cook arrived in 1773 and 1777 and named the islands the Hervey Islands; the name "Cook Islands", in honor of Cook, appeared on a Russian naval chart published in the 1820s.
    • Woodcarving is a common art form in the Cook Islands.
    • Another popular art form in the Cook Islands is tivaevae—the art of handmade Island scenery patchwork quilts.
    • The Cook Islands has produced internationally recognized contemporary artists, especially in the main island of Rarotonga.
    • These islands share similar artistic traditions of other Pacific Islands, including the art of tattooing.
  • Rhode Island

    • Rhode Island was formed as an English colony by Roger Williams and others fleeing prosecution from Puritans.
    • Williams named the other islands in the Narragansett Bay after virtues: Patience Island, Prudence Island, and Hope Island.
    • In 1637, Hutchinson also purchased land on Aquidneck Island from the American Indians, settling in Pocasset, now known as Portsmouth, Rhode Island.
    • During King Philip's War (1675–1676), both sides regularly violated Rhode Island's neutrality.
    • Discuss the founding of the Rhode Island Colony and Providence Plantations
  • Transfusions of Whole Blood

    • Whole blood refers to human blood transfusion from a standard blood donation.
    • Whole blood may also be altered and processed for use in blood transfusion.
    • Historically, blood was transfused as whole blood without further processing.
    • Whole blood transfusion has similar risks to those of transfusion of red blood cells.
    • Whole blood is a term used in transfusion medicine for human blood from a standard blood donation.
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