Lymphatic System

Question 0

Main components of lymphatic system

Answer 0

• Lymph capillaries- drain and process extra-cellular fluid
• Lymph vessels- reservoir for cells and plasma that leak from vascular system- transport lymph fluid back to circulatory system
• lymph nodes/glands- filters foreign particles

Question 1

Role of lymphatic system

Answer 1

• Collect and transport fluid that escapes from blood capillaries to circulatory system
• protect from foreign matter

Question 2

Describe the lymphatic system as a drainage system

Answer 2

1. Blood comes into capillaries- high pressure/nutrients
2. Capillaries smaller diameter- blood under pressure- plasma forced into tissue fluid
3. Cells take water and nutrients needed by osmosis- extra fluid stays between cells(in extracellular fluid)
4. Excess fluid passes into lymph vessels
5. Lymph vessel joins with larger blood vessel(vein) plasma will be put back into blood

Question 3

Lymphatic system as a non-specific defence system

Answer 3

-lymph enters lymph nodes contain cell debris, foreign particles, micro-organisms-penetrate body
-cause disease if not destroyed
-bacteria- trapped in mesh work of fibres as lymph flows through spaces in nodes
-macrophages destroy bacteria
-macrophages ingest particles by phagocytosis- protection from macrophages surround particle-take into cell- destroyed by enzymes
-cause of swelling of nodes- infection
Inside node that causes swelling- increase no. of lymphocytes- lymph nodes become swollen and sore
-nodes are in neck, arm pits, groin, and alimentary canal