Question

The most important center of lymph formation is
a) Liver
b) Spleen
c) Bone marrow
d) Mucosa of ileum

Answer 1

Hint: Firstly, we must know that lymph is a clear to pale-white fluid that circulates throughout the lymphatic system. The main role of the lymphatic system is to act as a filter against the microbes, organic wastes and the other debris. The lymph comprises the lymph plasma, the lymph corpuscles and the lymphoid organs.

Complete answer:
Lymph is formed from the interstitial fluids which seep through the thin capillary walls into the body’s tissues.
Lamina propria of the mucous membrane consists of loose connective tissue and containing germinal centers and large aggregates of lymphoid tissue which are called as Peyer's patches, which is a distinctive feature of the ileum.
The spleen, tonsils, adenoids and the thymus form a part of the lymphatic system. The spleen is considered as the largest lymphatic organ in the system, which is situated under the ribcage, above the stomach, and exactly in the left upper quadrant of the abdomen. Other parts of the lymphatic system which are tonsils, adenoids and thymus are located on either side of the throat and the neck.
Hence, we can say that liver, spleen and bone marrow are not involved in the most important centre of lymph formation. Therefore options A, B and C are incorrect.

So, the correct answer is option D) which is mucosa of ileum.

Note:
All substances that are transported by the lymph passes through at least one of the lymph nodes, where the foreign substances can be filtered out and also destroyed before the fluid is returned to the bloodstream. In the lymph nodes, WBC can collect and interact with each other and also with antigens, and generate immune responses to foreign substances.