click below
click below
Normal Size Small Size show me how
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 |