In the lymphatic system
A - VCE - SSCE Biology - Question 20 - 2013 - Paper 1
Question 20
In the lymphatic system
A. clonal selection occurs.
B. mast cells are produced.
C. vessels have thick, muscular walls.
D. lymph is pumped by the heart.
Worked Solution & Example Answer:In the lymphatic system
A - VCE - SSCE Biology - Question 20 - 2013 - Paper 1
Step 1
A. clonal selection occurs.
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Answer
Clonal selection is a process that happens primarily in the adaptive immune system, particularly during the development and activation of B and T lymphocytes. While lymphocytes originate from the lymphatic system, clonal selection itself occurs in lymphoid tissues, not as a defining feature of the lymphatic system.
Step 2
B. mast cells are produced.
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Answer
Mast cells are indeed involved in the immune response, typically derived from progenitor cells in the bone marrow, but they generally reside in tissues and are not a direct product of the lymphatic system's functions. Therefore, this option is misleading.
Step 3
C. vessels have thick, muscular walls.
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Answer
Lymphatic vessels have thinner walls than blood vessels and are not considered to have thick, muscular walls. This statement is inaccurate.
Step 4
D. lymph is pumped by the heart.
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Answer
Lymph is not circulated by the heart. Instead, it relies on the movement of skeletal muscles and the contraction of smooth muscles in the lymphatic vessels to propel lymph throughout the body. This statement is incorrect.
