The lymphatic system
A - VCE - SSCE Biology - Question 23 - 2006 - Paper 1
Question 23
The lymphatic system
A. has no valves.
B. contains red blood cells.
C. contains white blood cells.
D. contains fluid that flows in both directions.
Worked Solution & Example Answer:The lymphatic system
A - VCE - SSCE Biology - Question 23 - 2006 - Paper 1
Step 1
contains red blood cells.
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Answer
This statement is incorrect. The lymphatic system does not contain red blood cells; it primarily carries lymph, which is a clear fluid. Red blood cells are part of the circulatory system.
Step 2
contains white blood cells.
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Answer
This statement is correct. The lymphatic system is integral to the immune system and contains white blood cells, particularly lymphocytes, that help in defending the body against infections.
Step 3
has no valves.
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Answer
This statement is incorrect. The lymphatic vessels have valves that prevent the backflow of lymph, ensuring it flows in one direction toward the lymph nodes and ultimately the bloodstream.
Step 4
contains fluid that flows in both directions.
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Answer
This statement is incorrect. The fluid in the lymphatic system, known as lymph, flows primarily in one direction—from the tissues back to the heart—unlike blood in veins which flows both ways.
