Podcast Beta
Questions and Answers
What is the main function of the lymphatic system in the body?
What is the term given to the tissue fluid once it has entered a lymphatic vessel?
Which of the following tissues or organs do not have lymphatics?
What is the characteristic of lymphatic capillaries?
Signup and view all the answers
What is the function of lymphatic anchoring filaments?
Signup and view all the answers
What is the term given to a rounded mass of packed small B-lymphocytes?
Signup and view all the answers
What is the characteristic of the peripheral zone of a lymphatic nodule?
Signup and view all the answers
What is the function of macrophages in lymphatic nodules?
Signup and view all the answers
Where are lymphatic nodules typically found?
Signup and view all the answers
What is the function of lymphatic nodules in terms of antibody production?
Signup and view all the answers
What is the primary function of primary lymphoid organs?
Signup and view all the answers
What is the normal fate of the thymus during puberty?
Signup and view all the answers
Where is the thymus situated in the body?
Signup and view all the answers
What is unique about the thymus in terms of T-cell specificity?
Signup and view all the answers
What is the function of the desmosomes in the thymic epithelial cells?
Signup and view all the answers
What is the main difference between the cortex and medulla in the thymus?
Signup and view all the answers
What is the function of the Hassall's corpuscles in the thymus?
Signup and view all the answers
What is the shape of a lymph node?
Signup and view all the answers
Where do the efferent lymphatics leave the lymph node?
Signup and view all the answers
What enters the lymph node at the convex surface?
Signup and view all the answers
Study Notes
Lymphatic System
- Formed from lymph vessels and lymphatic tissue
- Assists the cardiovascular system in removing tissue fluid from interstitial spaces and returning it to the blood
- Lymph is the name given to tissue fluid once it enters a lymphatic vessel
Lymphatic Vessels
- Lymphatic capillaries: small, thin-walled, irregularly shaped endothelial tubes surrounded by delicate connective tissue with lymphatic anchoring filaments
- Small and medium-sized lymphatics: have an endothelial lining and a layer of connective tissue
- Large lymphatics: similar to veins, with three layers and valves to prevent backflow
Lymphatic Nodules
- Rounded, circumscribed masses of cells
- Primary nodule: packed small B lymphocytes
- Secondary nodule: formed of a central pale germinal center and a peripheral dark zone
- Sites: lamina propria of digestive and respiratory passages, white pulp of the spleen, and lymph nodes
- Functions: produce lymphocytes, have phagocytic activity, and produce antibodies
Lymphatic Organs
- Primary lymphoid organs: bone marrow and thymus, responsible for development and maturation of lymphocytes
- Secondary lymphoid organs: provide sites for immunocompetent cells to react with antigens and build up immunological response
- Secondary lymphoid organs include: lymph nodes, spleen, tonsils, and mucosa-associated lymphoid tissues
Thymus
- Primary lymphoid organ responsible for maturation of T-lymphocytes
- Site: superior mediastinum
- T-cell specificity is acquired only in the thymus
- Structure: 2 lobes, with each lobule divided into dark peripheral cortex and pale central medulla
- Cortex: contains epithelial reticular cells, immature T-lymphoblasts, mature T-lymphocytes, and macrophages
- Medulla: contains thymic epithelial cells, Hassall's corpuscles, and mature T-lymphocytes
Lymph Node
- Ovoid or kidney-shaped body
- Convex surface: afferent lymphatics enter
- Hilum: efferent lymphatics leave, and blood vessels and nerves enter or leave
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
This quiz covers the structure and function of the lymphatic system, including its relationship with the cardiovascular system and the role of lymphatic vessels and tissue.
