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Questions and Answers
Which of the following is a component of the lymphatic tissue?
Which of the following is a component of the lymphatic tissue?
- Arterioles
- Blood capillaries
- Lymph vessels (correct)
- Venules
What is the chief cellular constituent of lymphatic tissue?
What is the chief cellular constituent of lymphatic tissue?
- Pericytes
- Endothelial cells
- Smooth muscle cells
- Lymphocytes (correct)
Which layer forms the outermost part of lymph vessels?
Which layer forms the outermost part of lymph vessels?
- Tunica media
- Endothelium
- Tunica intima
- Tunica adventitia (correct)
What is a characteristic of lymph capillaries compared to blood capillaries?
What is a characteristic of lymph capillaries compared to blood capillaries?
Where do lymph vessels pour lymph into?
Where do lymph vessels pour lymph into?
What are the chief components of the lymphatic system?
What are the chief components of the lymphatic system?
What is the function of lymphatic tissue in the body's defense system?
What is the function of lymphatic tissue in the body's defense system?
What are the characteristics of lymph vessels?
What are the characteristics of lymph vessels?
How do lymph capillaries differ from blood capillaries?
How do lymph capillaries differ from blood capillaries?
What is the key element in an immune response and the chief cellular constituent of lymphatic tissue?
What is the key element in an immune response and the chief cellular constituent of lymphatic tissue?
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Study Notes
Lymphatic System
- The lymphatic system monitors internal fluid compartments and reacts to the presence of potentially harmful antigenic substances.
- It consists of groups of cells, tissues, and organs that form the second line of defense against invaders.
Lymphatic Tissue
- Composed of lymph vessels and lymphoid organs.
- Lymphocytes are the chief cellular constituents of lymphatic tissue and play a key role in immune responses.
Lymph Vessels
- Carry lymph fluid.
- Characterized by a wider lumen compared to blood vessels.
- Pour lymph into the thoracic duct.
- Have very thin walls composed of three tunics:
Tunic Structure
- Tunica intima: consists of endothelium and a subendothelial layer of loose connective tissue (LCT).
- Tunica media: formed of a smooth muscle layer arranged in a circular manner.
- Tunica adventitia: the outermost layer, formed of LCT.
Comparison of Blood Capillaries and Lymph Capillaries
- Blood capillaries:
- Are narrow and regularly shaped.
- Start from arterioles and end in venules.
- Lined by endothelium.
- Have a basement membrane.
- Have pericytes.
- Lymph capillaries:
- Similar to blood sinusoids.
- Irregularly shaped.
- Have blind endings.
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