lymphatic system anatomy and physiology pdf

Lymphatic system anatomy and physiology pdf

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Lymphatic system

What does the lymphatic system do?

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Last reviewed: June A system of vessels in the vertebrate body, beginning in a network of exceedingly thin-walled capillaries in almost all the organs and tissues, except the brain and bones.

The lymphatic system is a one-way vascular network in vertebrates that works in parallel with the blood circulation Fig. It drains interstitial fluid from most of the body's organs, with the exceptions of bone marrow, the retina, the central nervous system, and some avascular tissues the cornea, cartilage, hair, nails, and epidermis.

The interstitial fluid, which is rich in protein, must be removed, or swelling edema will occur. When the drainage function of the lymphatics is disturbed, serious swelling can occur; this condition is called lymphedema.

When working normally, though, the lymphatic network is drained by larger channels, mostly coursing along the veins and eventually joining to form a large vessel the thoracic duct , which runs beside the spinal column to enter the left subclavian vein at the base of the neck. The lymph fluid originates in the tissue spaces by filtration from the blood capillaries. While in the lymphatic capillaries, it is clear and watery. However, at intervals along the larger lymphatic vessels, the lymph passes through spongelike lymph nodes, where it receives great numbers of cells—the lymphocytes—and becomes turbid.

With the exception of the capillaries, the lymphatic vessels contain numerous valves preventing backflow of the lymph Fig. In addition to fluid drainage, the functions of the lymphatic system are to remove particulate materials for example, molecular proteins and bacteria from tissues, to transport fat from the intestine to the blood, and to supply the blood with lymphocytes the chief cells of the immune system, including T cells arising from the thymus and B cells produced in the bone marrow.

The formation of new lymphatic vessels is termed lymphangiogenesis. To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.

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Last reviewed: June A system of vessels in the vertebrate body, beginning in a network of exceedingly thin-walled capillaries in almost all the organs and tissues, except the brain and bones. The lymphatic system is a one-way vascular network in vertebrates that works in parallel with the blood circulation Fig. It drains interstitial fluid from most of the body's organs, with the exceptions of bone marrow, the retina, the central nervous system, and some avascular tissues the cornea, cartilage, hair, nails, and epidermis. The interstitial fluid, which is rich in protein, must be removed, or swelling edema will occur.

The immune system is the complex collection of cells and organs that destroys or neutralizes pathogens that would otherwise cause disease or death. The lymphatic system, for most people, is associated with the immune system to such a degree that the two systems are virtually indistinguishable. The lymphatic system is the system of vessels, cells, and organs that carries excess fluids to the bloodstream and filters pathogens from the blood. The swelling of lymph nodes during an infection and the transport of lymphocytes via the lymphatic vessels are but two examples of the many connections between these critical organ systems. A major function of the lymphatic system is to drain body fluids and return them to the bloodstream. Blood pressure causes leakage of fluid from the capillaries, resulting in the accumulation of fluid in the interstitial space—that is, spaces between individual cells in the tissues. In humans, 20 liters of plasma is released into the interstitial space of the tissues each day due to capillary filtration.

The lymphatic system consists of all lymphatic vessels and lymphoid organs. Hence, rather than representing a single organ, the lymphatic system comprises a circulatory network of vessels and lymphoid tissue and cells in every part of the body. It works together closely with the blood-producing haematopoietic system in the bone marrow, thereby playing a vital role in immune responses to protect the body from various pathogens. Also, the lymphatic vessel network helps transporting nutrients and waste products in the body. The lymphatic system with its vessel network is — apart from the circulatory system, with which it is closely connected — the most important transport system in the human body.

Lymphatic system

The lymphatic system is a collection of structures and vessels that drains lymph from blood and has several other functions. It is a circulatory system for lymph fluid and the site of many key immune system functions. The lymphatic vessels are the lymphatic system equivalent of the blood vessels of the circulatory system and drain fluid from the circulatory system.

Lymphatic system , a subsystem of the circulatory system in the vertebrate body that consists of a complex network of vessels, tissues , and organs. The lymphatic system helps maintain fluid balance in the body by collecting excess fluid and particulate matter from tissues and depositing them in the bloodstream. It also helps defend the body against infection by supplying disease-fighting cells called lymphocytes. This article focuses on the human lymphatic system.

This article, the first in a six-part series , gives an overview of the lymphatic system, which circulates lymph fluid around the body to drain tissue, transport fat and activate immune responses. This article is the first in a six-part series about the lymphatic system. It discusses how the system is structured and how it functions, focusing on tissue drainage, fat transportation and activation of immune responses. It also examines the causes, symptoms and treatment of oedema.

19.1A: Structure of the Lymphatic System

The lymphatic system is part of the immune system.

What does the lymphatic system do?

The lymphatic system , or lymphoid system , is an organ system in vertebrates that is part of the circulatory system and the immune system. It is made up of a large network of lymph, lymphatic vessels , lymph nodes, lymphatic or lymphoid organs, and lymphoid tissues. Unlike the cardiovascular system, the lymphatic system is not a closed system. The human circulatory system processes an average of 20 litres of blood per day through capillary filtration , which removes plasma from the blood. Roughly 17 litres of the filtered plasma is reabsorbed directly into the blood vessels , while the remaining three litres are left in the interstitial fluid. One of the main functions of the lymphatic system is to provide an accessory return route to the blood for the surplus three litres.

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Lymphatic system

2 comments

  • Arnou B. 07.05.2021 at 22:08

    network of tissues, organs and vessels that help to maintain the body's fluid balance & protect it from pathogens. • lymphatic vessels, lymph nodes, spleen.

    Reply
  • Silwordnipho 13.05.2021 at 01:48

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