Question

Which one of the following lymphoid organs is large at birth but reduces with age?

• A. Bone marrow
• B. Thymus
• C. Spleen
• D. Peyer’s patches

Answer 1

The Correct Option is B

The query involves understanding which lymphoid organ is notably large at birth but diminishes in size as a person ages. Among the options given, the thymus is the correct answer.

1. Thymus: This is an organ located in the upper chest, beneath the sternum. It is crucial for the development of T-cells, a type of white blood cell involved in immune response. The thymus is largest and most active during infancy and childhood.
2. Reduction with Age: After puberty, the thymus begins to shrink and is gradually replaced by adipose (fat) tissue. Despite this reduction, it permanently imprints T-cells with the ability to recognize and respond to pathogens.

In summary, the thymus starts large at birth and reduces in size as one ages, unlike the other lymphoid organs mentioned in the options.

Answer 2

The thymus is a lymphoid organ that is large at birth and during childhood, but it gradually reduces in size with age. This process is called involution, and by adulthood, the thymus is much smaller and primarily composed of fatty tissue. The thymus plays a crucial role in the development of T-cells, which are essential for the immune system.

• Bone marrow remains important throughout life for the production of blood cells.
• Spleen maintains its functional importance throughout life but does not undergo a reduction in size similar to the thymus.
• Peyer's patches are small lymphoid tissues found in the intestines, and their size remains relatively stable throughout life.