MICROANATOMY

Detailed explanation-1: -The lymph nodes and other lymphatic structures like the spleen and thymus hold special white blood cells called lymphocytes. These can rapidly multiply and release antibodies in response to bacteria, viruses, and a range of other stimuli from dead or dying cells and abnormally behaving cells such as cancer cells.

Detailed explanation-2: -The tissues and organs that produce, store, and carry white blood cells that fight infections and other diseases. This system includes the bone marrow, spleen, thymus, lymph nodes, and lymphatic vessels (a network of thin tubes that carry lymph and white blood cells).

Detailed explanation-3: -The correct answer is (b) Bone Marrow. Bone marrow is a primary or central lymphoid organ that is responsible for the production of all blood cells. All blood cells (RBCs, WBCs, and platelets) arise from the hematopoietic stem cells (HSCs) which are multipotent stem cells present in the bone marrow.

Detailed explanation-4: -Lymphocytes develop in the thymus and bone marrow (yellow), which are therefore called central (or primary) lymphoid organs.