Questions and Answers
What are the two parts of the Lymphatic System?
Lymphatic vessels and Lymphoid tissues and organs
What are the functions of the Lymphatic System?
Transport fluids back to blood, provide defense against infectious diseases and cancer, harbor leukocytes, absorb dietary lipids from the digestive tract.
List the organs involved in the Lymphatic System.
Lymph, lymph nodes & vessels, spleen, thymus, tonsils, SALT and MALT.
What is lymph?
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How is lymph made?
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What parts of lymph are returned in the blood?
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What are harmful materials that enter lymphatic vessels?
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What is the role of lymphatic collecting vessels?
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What does the fluid return through to get to the circulatory veins near the heart?
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What is the job of lymph nodes?
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Which leukocytes are present in lymph nodes?
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What is the role of the spleen?
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What is the role of the thymus?
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What is the role of the tonsils?
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What is the role of Peyer's Patches?
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What is MALT?
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What does MALT include?
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Study Notes
Lymphatic System Overview
- Consists of lymphatic vessels and lymphoid tissues and organs.
- Functions to transport fluids back to blood and provides defense against diseases.
Functions of the Lymphatic System
- Returns excess interstitial fluid to the cardiovascular system.
- Provides defense against infectious diseases and cancer.
- Harbors leukocytes for immune responses.
- Absorbs dietary lipids from the digestive tract.
Key Organs in the Lymphatic System
- Lymph
- Lymph nodes and vessels
- Spleen
- Thymus
- Tonsils
- SALT (Skin-Associated Lymphoid Tissue) and MALT (Mucosa-Associated Lymphoid Tissue)
Lymph Characteristics
- Composed of excess tissue fluid.
- Formed from interstitial fluid forced out at capillary beds and not reabsorbed.
Lymph Composition and Vessels
- Returned to blood as dissolved proteins and water.
- Harmful materials such as proteins, cell debris, cancer cells, bacteria, and viruses can enter lymphatic vessels.
Transport and Filtration in the Lymphatic System
- Lymphatic collecting vessels transport lymph to lymph nodes where it is filtered.
- Returns fluid through the right lymphatic duct and thoracic duct into the circulatory veins near the heart.
Role of Lymph Nodes
- Protect the body by removing foreign materials like bacteria and tumor cells.
- Contain leukocytes: lymphocytes for specific invader destruction and macrophages for non-specific invader destruction.
Functional Overview of Key Organs
- Spleen: Filters blood, removes aged RBCs, forms blood in fetuses, and stores blood.
- Thymus: Active primarily during childhood, produces thymosin to program lymphocytes.
- Tonsils: Trap and remove debris and foreign substances at the pharynx.
- Peyer's Patches: Capture and destroy bacteria in the intestines.
- MALT: Protects respiratory and digestive tracts, includes Peyer's patches and tonsils.
Additional Lymphatic Components
- SALT and MALT: Protects mucous membranes, with specific functions in immunity and bacterial control.
- Appendix: Similar function to Peyer's patches, supports beneficial bacteria in the colon.
Immune Surveillance
- Lymphatic tissues monitor for pathogens in skin and mucosal membranes, facilitating immune responses.
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Description
This quiz focuses on the organs and functions of the lymphatic system. It covers key components such as lymphatic vessels, lymphoid tissues, and their roles in fluid transport and immune defense. Test your knowledge with these flashcards!
