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68WM6 AP 3 Lymphatic
Lymphatic System and Immunity
| Question | Answer |
|---|---|
| Lymph | fluid in the tisse spaces that carries protein molecules and other substances back to the blood |
| Lymphatic vessels | permit only one-way movement of lymph |
| Lymphatic capillaries | tiny blind-ended tubes distributed in tisse spaces, consisting of single layer of simple squamous epithelium |
| Lacteals | located in the intestinal wall, fat transportation from food to bloodstream |
| Right lymphatic duct | drains lymph from the right upper extremity and right side of head, neck, and upper torso |
| Thoracic duct | largest lymphatic vessel, drain lymph from about 3/4 of the body |
| cisterna chyli | an enlarged puch along the thoracic duct |
| lymph nodes | filter lymph, located in clusters along the pathway of lymphatic vessels |
| functions of lymph nodes: | defense and WBC formation |
| Thymus | lymphoid tissue organ located in mediastinum, weight of 35-40g |
| Thymus cont'd | plays a vital and central role in immunity, produces T-lymphocytes, or T cells |
| Thymosins | hormones secretes by thymus |
| Involution | replaced the lymphoid tisse is largely replaced by fat |
| Tonsils | composed of three masses of lymphoid tisse around the openings of the mouth and throat |
| Palatine tonsils | the tonsils |