![]() The structural divisions within a lymph node serve different purposes. ![]() As these cells pass through the HEVs, they bind to the receptors and are carried into the paracortex of the lymph node. HEVs contain a single layer of large endothelial cells that possess surface receptors specific for B and T lymphocytes. Lymphocytes generally enter through specialized blood vessels called high endothelial venules (HEVs). These vessels may drain directly from the lymphatic capillaries, or they may be connected to a previous node. Lymph and its associated cells enter through the afferent lymphatic vessels, which drain into each node through its convex surface. You may know that the human brain is composed of two halves, but what fraction of the human body is made up of blood? Learn this fact and much more as you test both halves of your mind in this human anatomy quiz.Ĭells enter the lymph node through two primary routes. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.From tech to household and wellness products. Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.
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