Lymphatic System
- 3. Lymphatic System • The lymphatic system is part of the immune system and helps destroy microorganisms that enter the body. • Your lymphatic system works closely with your circulatory system. Both systems move liquids through the body, and both contain white blood cells.
- 4. FUNCTIONS of the Lymphatic System • It absorbs some of the tissue fluid that collects around cells.
- 5. • It absorbs fats from the digestive system and transports them to the circulatory system. FUNCTIONS of the Lymphatic System
- 6. • It filters dead cells, viruses, bacteria, and other unneeded particles from tissue fluid. • After filtering, it returns the tissue fluid to the circulatory system. FUNCTIONS of the Lymphatic System
- 7. • It helps fight off illnesses and infections. • The lymphatic system includes structures where your body’s white blood cells develop. FUNCTIONS of the Lymphatic System
- 8. PARTS of the Lymphatic System • The lymphatic system is a network of vessels and organs that runs throughout your body.
- 9. PARTS of the Lymphatic System • Water, white blood cells, and dissolved materials such as salts and glucose leak out of capillary walls. • They move into the space that surrounds tissue cells. This fluid is called tissue fluid. Lymph
- 10. PARTS of the Lymphatic System • The cells absorb the materials they need from tissue fluid and release wastes into it. Lymph
- 11. PARTS of the Lymphatic System • About 90 % of the tissue fluid is reabsorbed by the capillaries. • About 10 % of the tissue fluid is absorbed by the lymph vessels and is called lymph. Lymph
- 12. PARTS of the Lymphatic System • The network of lymph vessels looks like the network of blood vessels in the circulatory system. • Lymph vessels absorb and transport lymph. Lymph Vessels
- 13. PARTS of the Lymphatic System • The network of lymph vessels looks like the network of blood vessels in the circulatory system. • Lymph vessels absorb and transport lymph. Lymph Vessels
- 14. PARTS of the Lymphatic System • Lymph is pushed through the lymph vessels by contractions of the muscles in your body. • The heart does not pump lymph through the body. Lymph Vessels
- 15. PARTS of the Lymphatic System • Lymph vessels include clusters of small, spongy structures called lymph nodes that filter particles from lymph. Lymph Nodes
- 16. PARTS of the Lymphatic System Lymph Nodes
- 17. PARTS of the Lymphatic System • A lymph node traps and removes bacteria, viruses, fungi, and pieces of dead cells from the lymph as it flows through a lymph node. Lymph Nodes
- 18. PARTS of the Lymphatic System • Lymph nodes also store white blood cells. • These white blood cells attack and destroy the trapped particles. Lymph Nodes
- 19. PARTS of the Lymphatic System • When you have an infection, your body produces more white blood cells that fight the infection. • Many of these white blood cells gather in your lymph nodes. • This causes the lymph nodes to swell. • The swelling goes away when the infection is gone. Lymph Nodes
- 20. PARTS of the Lymphatic System Lymph Nodes
- 21. PARTS of the Lymphatic System Lymph Nodes
- 22. PARTS of the Lymphatic System Lymph Nodes
- 23. PARTS of the Lymphatic System • Some white blood cells are lymphocytes. • Lymphocytes destroy pathogens, which are microorganisms such as viruses and bacteria that cause infection. Lymphocytes
- 24. PARTS of the Lymphatic System Lymphocytes • Lymphocytes include B cells and T cells. • B cells mature in bone marrow. • T cells mature in thymus gland.
- 25. PARTS of the Lymphatic System Lymphocytes • The thymus is the organ of the lymphatic system in which T cells complete their development. • Immature T cells move from the bone marrow to the thymus.
- 26. PARTS of the Lymphatic System Lymphocytes • T cells in the thymus develop the ability to recognize and destroy body cells that have been infected by microorganisms. • Mature B cells and T cells move into the lymph and blood where they help fight infection.
- 27. PARTS of the Lymphatic System • The spleen is an organ of the lymphatic system that recycles worn-out red blood cells and produces and stores lymphocytes. Spleen
- 28. PARTS of the Lymphatic System • The spleen also stores blood and platelets. • If a person is injured and loses a lot of blood, the spleen can release stored blood and platelets into the circulatory system. Spleen
- 29. PARTS of the Lymphatic System • Tonsils are clusters of lymph tissue on the sides of your throat. • They help protect your body from infection. Tonsils
- 30. PARTS of the Lymphatic System • Tonsils are clusters of lymph tissue on the sides of your throat. • They help protect your body from infection, trapping & destroying bacteria and other pathogens that enter your nose and mouth. • However, your body can function without tonsils. Tonsils
- 31. PARTS of the Lymphatic System Tonsils
- 32. Lymph Diseases and Disorders • Damage to the lymphatic system from injury or surgery can keep tissue fluid from draining into lymph vessels. • Tissue fluid can build up around cells and cause swelling. • Lack of activity can also cause swelling. • When the muscles do not push lymph through the lymph vessels, lymph can build up.
- 33. Lymph Diseases and Disorders • If the cells of your tonsils become infected, your tonsils will swell. This condition is tonsillitis.
- 34. Lymph Diseases and Disorders
- 35. Lymph Diseases and Disorders • The uncontrolled production of white blood cells is a type of cancer called lymphoma. • Cancer of the lymph nodes is a related disease called Hodgkin’s lymphoma.
- 36. Lymphatic System and Homeostasis • The lymphatic system helps your body maintain homeostasis by keeping tissue fluids from building up around cells. • It supports your circulatory system by cleaning fluids and replacing them in the bloodstream. • It also helps you stay healthy by fighting infection.