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The lymphatic system A - VCE - SSCE Biology - Question 9 - 2008 - Paper 1
Question 9
The lymphatic system A. controls blood clotting. B. contains red blood cells. C. has vessels with thick muscular walls. D. contains phagocytic cells.
Worked Solution & Example Answer:The lymphatic system A - VCE - SSCE Biology - Question 9 - 2008 - Paper 1
Step 1
D. contains phagocytic cells.
Answer
The lymphatic system is an essential part of the immune system and plays a significant role in defending the body against pathogens. It contains phagocytic cells, specifically macrophages and dendritic cells, which are crucial for the recognition and elimination of foreign invaders, such as bacteria and viruses.
The other options are incorrect because:
- A. controls blood clotting.: This function is mainly performed by platelets in the blood, not the lymphatic system.
- B. contains red blood cells.: The lymphatic system does not normally contain red blood cells; these are exclusively found in the bloodstream.
- C. has vessels with thick muscular walls.: The vessels in the lymphatic system are more similar to veins and are not characterized by thick muscular walls like arteries.