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Immune system
The purpose of this topic is to study the lymph nodes, spleen, thymus and tonsils. The immune system include not only the lymphoid organs, but also diffuse aggregations of lymphocytes. Blood cells that form part of the immune system is covered in the topic on Blood and Bone Marrow. Also review the specific immune tissues found in other systems.
You should be able to:
- List the components of the lymphatic system.
- Describe the general properties of primary and secondary lymphoid tissues, including lymph fluid, vessels, ducts and organs.
- Describe the functional differences between primary and secondary lymphoid tissues.
- Identify and describe the structure and function of lymphoid tissue, lymph nodes, spleen, thymus and tonsils.
- Describe the processes taking place in the different locations of lymphoid tissues.
- Describe the functional organisation of lymphoid tissues.
- Describe the cells present in the different locations of lymphoid tissues.
- Describe the blood and lymph flow through lymphoid tissues.
- Identify Hassall's corpuscles in the thymus.
- Correlate the function of lymphoid tissues with that of bone marrow.
- Correlate the function of lymphoid tissues with other body systems.
Slides for this week
For each slide, complete the work as listed below. Completing the whole slide will assist you in understanding and retention. For each slide, allocate an A3 spread in your workbook. Remember to add the slide and its page number to the index in the front of the book.
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Calibration
- Differentiate between the thymus, lymph nodes and spleen.
- Lymphoid tissue is an adaptive immune response to protect against pathogens that penetrate barrier defenses. How does barrier defenses protect against pathogens? Complete the table.
| Barrier Defenses |
| Site |
Specific defense |
Protective aspect |
| Skin |
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| Skin (sweat/secretions) |
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| Oral cavity |
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| Stomach |
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| Mucosal surfaces |
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| Normal flora (nonpathogenic |
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