Questions and Answers
Which organ filters blood and initiates immune responses?
Which organ filters lymph and initiates immune responses?
What is the lymphatic system organ that shrinks and becomes non-functional with age?
Thymus
What are the functions of lymph nodes?
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Are lymphatic nodules encapsulated lymphatic organs?
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What are the lymphatic organs of the oral cavity and pharynx?
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The right lymphatic duct receives lymph from all body regions except?
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Lymph from the lower limbs is conveyed by?
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Pharyngeal tonsils are also called?
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Why is lymph drainage important?
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These vessels of the lymphatic system are found in most tissues and drain excess tissue fluid.
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Which lymphatic organs have roles in defending the body against pathogens?
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Why does the lymphatic venous system aid in the absorption of fats and not the blood?
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What drives the filtration of plasma and small molecules from the blood into the interstitial spaces?
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This pressure of the blood pulls fluid back into the capillaries by osmosis.
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The rate of filtration exceeds the rate of?
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What is fluid entering the lymphatic capillaries called?
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What type of cell is in the subcapsule of a lymph node?
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What type of cell is in the medulla of a lymph node?
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What type of cell is found in the germinal centers of the cortex?
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Clusters of lymphocytes and macrophages found in the cortex of lymph nodes are called?
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Clusters of cells called lymph nodules are also found in?
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What are Peyer's patches?
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What are the combined lymph nodules of the digestive, respiratory, and genitourinary tracts called?
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Study Notes
Spleen and Thymus
- Spleen filters blood and initiates immune responses.
- Thymus filters lymph and also initiates immune responses; it shrinks and becomes non-functional with age.
Lymph Nodes
- Function as filters for lymph, initiating immune responses to foreign materials.
- Contain macrophages and B cells in the subcapsule and T cells in the medulla.
Lymphatic Nodules
- Not encapsulated; instead, they are clusters of immune cells without a connective tissue capsule.
Tonsils
- Lymphatic organs located in the oral cavity and pharynx.
Lymphatic Ducts
- The right lymphatic duct receives lymph from most body regions except the lower limbs.
- Lymph from the lower limbs is conveyed through the thoracic duct.
Pharyngeal Tonsils
- Also known as adenoids.
Importance of Lymph Drainage
- Facilitates absorption of fats, return of small proteins to blood, provision of nutrients to tissue cells, and transport of foreign particles to lymph nodes.
Lymphatic Capillaries
- Found in most tissues and drain excess tissue fluid, contributing to fluid balance.
Immune Defense
- Thymus, spleen, and lymph nodes play critical roles in defending the body against pathogens.
Fat Absorption
- The lymphatic system aids in fat absorption due to fat molecules being too large for absorption into blood.
Fluid Dynamics
- Blood pressure in capillaries drives filtration of plasma into interstitial spaces.
- Colloid osmotic pressure pulls fluid back into capillaries by osmosis.
- Rate of filtration often exceeds the rate of reabsorption, leading to tissue fluid formation.
Hydrostatic Pressure
- As interstitial fluid accumulates, hydrostatic pressure increases, driving fluid into lymphatic capillaries, which is then called lymph.
Lymph Node Cell Types
- Subcapsular area contains macrophages and B cells.
- Medulla contains macrophages and T cells.
- Germinal centers of the cortex are populated with B cells.
Lymph Nodules
- Found in the cortex of lymph nodes and as clusters in tonsils.
- Peyer's patches are lymph nodules located in the mucosal lining of the ileum of the small intestine.
- Mucosa-associated lymphoid tissues (MALT) consist of combined lymph nodules in the digestive, respiratory, and genitourinary tracts.
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Description
Explore the crucial components of the lymphatic system including the spleen, thymus, lymph nodes, and tonsils. Understand their functions in filtering blood and lymph, initiating immune responses, and supporting overall health. This quiz will test your knowledge of lymphatic organs and their importance in immunity.
