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Questions and Answers
What is the main function of lymph nodes in the body?
Which defense cell within lymph nodes is responsible for engulfing and destroying bacteria and viruses?
What is the main cause of swollen glands in the lymphatic system?
Which part of a lymph node contains follicles, which are collections of lymphocytes?
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What type of cells are responsible for releasing antibodies in the lymph nodes?
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Where are phagocytic macrophages primarily located in the lymph node?
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How does lymph flow through the lymph nodes to facilitate immune functions?
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What is the function of lymph nodes in the immune system?
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What is a key characteristic of lymphatic vessels?
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What drives the movement of lymph towards the heart in the lymphatic system?
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How do lymph capillaries differ from blood capillaries?
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Study Notes
- Lymph nodes:
- Help protect the body by removing foreign material and producing immune cells.
- Filter lymph before it returns to the heart.
- Located in inguinal, axillary, and cervical regions.
- Contain macrophages and lymphocytes for immune response.
- Swelling occurs due to trapping of foreign substances.
- Lymph Node Structure:
- Kidney-shaped and surrounded by fibrous capsule.
- Divided into several compartments by trabeculae.
- Contains cortex and medulla.
- Cortex contains follicles with germinal centers.
- Medulla contains medullary cords with phagocytic macrophages.
- Lymph Flow Through Nodes:
- Lymph enters through afferent lymphatic vessels.
- Flows through sinuses inside the node.
- Exits through efferent lymphatic vessels.
- WBC perform protective functions in the nodes.
- Lymphatic Vessels:
- Transport excess tissue fluid (lymph) towards the heart.
- Low pressure, pumpless system with thin-walled and larger vessels having valves.
- Lymph moves towards the heart by muscle action, pressure changes, and smooth muscle contractions.
- Lymph Capillaries:
- Colorless, blind-ended, thin-walled vessels with valves.
- Absorb tissue fluid and large substances from intercellular spaces.
- Blood Capillaries:
- Joined to arterioles and venules.
- Contain red blood and have a normal endothelium and basement membrane.
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Description
Learn about the functions of the lymphatic system and lymph nodes, including filtering lymph, removing foreign material, and producing lymphocytes for the immune response. Understand how these systems contribute to maintaining a healthy body.
