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Related Concept Videos

Functions of the Lymphatic and Immune System01:28

Functions of the Lymphatic and Immune System

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The lymphatic system plays a crucial role in bolstering our immune system. It consists of a network of lymphoid organs, lymph, and lymphatic vessels that provide structural and functional support in safeguarding the body against pathogens such as viruses and bacteria.
The primary lymphoid organs, including the bone marrow and the thymus, serve as the maturation sites for lymphocytes. Secondary lymphoid organs, like the mucosa-associated lymphoid tissue, activate these lymphocytes and serve as...
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Introduction to Lymphatic and Immune System01:22

Introduction to Lymphatic and Immune System

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Immunity is a crucial biological concept about our body's inherent capacity to prevent infections and diseases. A complex network of cells and tissues collectively known as the immune system facilitates this natural defense mechanism. The immune system plays an integral role in maintaining our health and well-being, shielding us from potential health threats.
The immune responses can be categorized into two types: innate and adaptive. Innate immunity comprises nonspecific defenses we are...
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Lymphoid Cells and Tissues01:18

Lymphoid Cells and Tissues

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Lymphoid cells and tissues are integral to the immune system, which is crucial in maintaining our body's defense against harmful pathogens. They form the building blocks of lymphoid organs, which include the spleen, thymus, and lymph nodes.
Lymphoid cells consist of various types of immune system cells. These include B and T lymphocytes, which are responsible for producing antibodies and killing infected cells, respectively. Dendritic cells act as messengers between the innate and adaptive...
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Secondary Lymphoid Organs01:15

Secondary Lymphoid Organs

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Secondary organs, including lymph nodes, the spleen, and mucosa-associated lymphoid tissue (MALT), work harmoniously to protect us from disease and infection.
The spleen is a vital organ in the lymphatic system, nestled in the upper left side of the abdomen. It is composed of two primary regions: the red pulp and the white pulp, each having distinct functions. The red pulp performs a significant role in blood filtration. It efficiently purges the blood of old or damaged red blood cells and...
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Lymphatic Vessels and Lymph Transport01:16

Lymphatic Vessels and Lymph Transport

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Lymphatic vessels, known as lymphatics, are crucial in transporting lymph from peripheral tissues to our venous system. This process begins with lymph entering through tiny capillaries that branch through tissues. These capillaries have unique features such as larger diameters, thinner walls, and a distinctive one-way valve system formed by overlapping endothelial cells.
This one-way system allows fluids, solutes, and even pathogens to enter but prevents their return to the intercellular...
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Primary Lymphoid Organs01:16

Primary Lymphoid Organs

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Primary lymphoid organs are pivotal in the formation, development, and maturation of lymphocytes, the white blood cells that serve as the backbone of our immune system. This crucial function underscores their fundamental role in maintaining our overall health and immunity. The two primary lymphoid organs of prime importance are the red bone marrow and the thymus.
The red bone marrow is a soft, spongy tissue nestled in the interior of long bones such as the humerus and femur. It is the site...
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Hyaluronan and Its Receptors: Key Mediators of Immune Cell Entry and Trafficking in the Lymphatic System.

Cells·2021
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Dendritic cell entry to lymphatic capillaries is orchestrated by CD44 and the hyaluronan glycocalyx.

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Related Experiment Video

Updated: Nov 7, 2025

Digestion of the Murine Liver for a Flow Cytometric Analysis of Lymphatic Endothelial Cells
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In Sickness and in Health: The Immunological Roles of the Lymphatic System.

Louise A Johnson1

  • 1MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK.

International Journal of Molecular Sciences
|April 30, 2021
PubMed
Summary

The lymphatic system

Keywords:
T-celladhesion moleculechemokinedendritic cellhigh endothelial venuleinflammationlymph nodelymphaticmigrationtrafficking

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Area of Science:

  • Immunology
  • Vascular Biology
  • Cell Biology

Background:

  • The lymphatic system is vital for immune responses, not just fluid transport.
  • Lymphatic endothelial cells (LECs) are specialized based on their location and function.
  • LECs regulate immune cell trafficking and interactions within lymph nodes.

Purpose of the Study:

  • To review the immune cell subsets within lymphatic vessels.
  • To explore how LECs regulate immune cell trafficking.
  • To understand the role of LECs in immune surveillance, tolerance, and inflammation.

Main Methods:

  • Literature review of studies on lymphatic vasculature and immune cell interactions.
  • Analysis of gene expression in different LEC subsets.
  • Examination of LEC function in response to inflammation and infection.

Main Results:

  • LECs exhibit unique structures and express specific molecules for efficient fluid and immune cell uptake.
  • LECs secrete factors that modulate leukocyte migration to lymph nodes.
  • LECs contribute to antigen presentation and lymph node organization.

Conclusions:

  • Lymphatic endothelial cells are key regulators of immune cell trafficking and function.
  • LECs play critical roles in both steady-state immunity and in response to pathological conditions.
  • Understanding LEC mechanisms is crucial for developing new immunotherapies.