GENERAL HISTOLOGY

Detailed explanation-1: -Primary lymphoid organs: These organs include the bone marrow and the thymus. They create special immune system cells called lymphocytes. Secondary lymphoid organs: These organs include the lymph nodes, the spleen, the tonsils and certain tissue in various mucous membrane layers in the body (for instance in the bowel).

Detailed explanation-2: -Most lymphocytes reside within lymphoid organs (lymph nodes, thymus, spleen, and bone marrow).

Detailed explanation-3: -Lymph nodes (or lymph glands) are small lumps of tissue that contain white blood cells, which fight infection. They are part of the body’s immune system and filter lymph fluid, which is composed of fluid and waste products from body tissues.