Lymphatic System

Question 1

lymphatic system function

Answer 1

bodily defense against infection

Question 2

lymphatic system is composed of…

Answer 2

• lymph (from interstitial fluid)
• lymphatic organs + tissues (thymus gland, lymph nodes)
• lymphatic vessels + capillaries

Question 3

lymphatic system: lymph

Answer 3

• 90% reenters blood
• 10% enters lymphatic capillaries
• circulation caused by skeletal muscle movement + smooth muscle contractions in walls

Question 4

lymph: lymphatic capillaries

Answer 4

• blind ended
• drain into collecting tubules
• flows away from tissues

Question 5

lymph nodes

Answer 5

• spots along length of collection vessels

- filters microorganisms, viruses or debris

Question 6

lymph nodes: lymphatic vessels

Answer 6

right lymphatic duct: dumps lymph from upper right body into right subclavian vein

thoracic duct: dumps lymph from lower body + top left into left subclavian vein
- begins as cisterna chyli

Question 7

lymphatic system: lymphatic organs classes

Answer 7

primary: red bone marrow, thymus
secondary: spleen, tonsils, lymph nodes

Question 8

primary lymphatic organs & tissues: red bone marrow

Answer 8

• location of B lymphocyte proliferation + maturation

developing fetus: location of B + T lymphocyte

Question 9

primary lymphatic organs & tissues: thymus

Answer 9

• location of T lymphocyte proliferation + maturation

Question 10

secondary lymphatic organs & tissues: tonsils (locations)

Answer 10

• palatine tonsils > 2 in oropharynx (commonly removed)
• pharyngeal tonsils > 1 in nasopharynx (adenoids when enlarged)
• lingual tonsils > 2 at base of tongue

Question 11

secondary lymphatic organs & tissues: spleen

Answer 11

• site of T + B lymphocyte proliferation
• filters blood
• destroys old RBC, bacteria, toxins

Question 12

secondary lymphatic organs & tissues: lymph nodes (locations)

Answer 12

• axillary > under arms
• cervical > in neck
• inguinal > groin area
• pelvic > abdominal area
• filter lymph and activate immune system when infectious agent located