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8 Cards in this Set
- Front
- Back
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Lymph |
fluid in the tissue spaces that carries protein molecules and other substances back to the blood |
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lymphatic vessels |
( Permit only one-way movement of lymph)
1. lymphatic capillaries- tiny blind-ended tubes distributed in tissue spaces a. microscopic in size b. sheets consisting of one cell layer of simple squamous epithelium c. Poor "fit" between adjacent cells results in porous walls d. called lacteals in the intestinal wall (fat transportation from food to bloodstream) |
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Right lymphatic duct |
Drains lymph fromt he right upper extremity and right side of head, neck, and upper torso |
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Thoracic duct |
A. largest lymphatic vessel
B. has an enlarged pouch along ints course, called cisterna chyli
C. Drains lymph from about three fourths of the body |
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Lymph nodes |
1. filter lymph
2. located in clusters along the pathway of lymphatic vessels
3. lymphoid tissue- mass of lymphocytes and related cells inside a lymphoid organ; provides immune function and development of immune cells
4. Lymph nodes and other lymphoid organs have functions that include defense and WBC formation
5. Flow of lymph; to node via several afferent lymphatic vessels and drained from node by a single efferent lymphatic vessel |
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Thymus |
1. lymphoid tissue organ located in mediastnium
2. total weight of 35 to 40 grams- a little more than an ounce
3. Plays a vital and central role in immunity
4. produces T lymphocytes, or T cells
5. Secretes hormones call thymosins, which influence T-cell development
6. Lymphoid tissue is replaced by fat ( during childhood) in the process called involution |
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Tonsils |
1. Composed of three masses of lymphoid tissue around the openings of the mouth and throat a. pa;atine tonsils b. Pharyngeal tonsils (adenoids) c. lingual tonsils
2. Subject to chronic infection
3. Enlargment of pharyngeal tonsils may impair breathing |
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Spleen |
1. largest lymphoid organ in the body
2. located in upper left quadrent of abdomen
3. Often injured by trauma to abdomen
4. surgical removal called splenectomy
5. Functions include phagocytosis of bacteria and old RBC's; acts as a blood reservoir |
