QUESTION: Which of the following is not a lymphoid tissue?
A Spleen
B Thymus
C Pancreas
D Tonsils
ANSWER: Pancreas
| Lymphoid Tissue | Introduction | Location | Function |
| Bone Marrow | Soft, spongy tissue within bones, primarily responsible for blood cell production. | Found within the cavities of bones, such as the pelvis and femur. | · Produces various blood cells, including lymphocytes (B and some T cells) · Serves as a reservoir for mature lymphocytes. |
| Thymus | A glandular organ involved in the development and maturation of T lymphocytes (T cells). | Located behind the breastbone (sternum). | · Provides an environment for the maturation and education of T cells before they enter the bloodstream. |
| Lymph Nodes | Small, bean-shaped structures that filter lymph fluid, removing pathogens and abnormal cells. | Distributed throughout the body’s lymphatic system. | · Filter and purify lymphatic fluid. · Capturing and destroying foreign particles and antigens · Supporting immune responses. |
| Spleen | A large organ that filters blood and serves as a reservoir for blood and immune cells. | Located in the upper left abdomen, beneath the ribcage. | · Filters blood, removes damaged blood cells and pathogens · Stores platelets · Participates in immune responses. |
| Tonsils | Collection of lymphoid tissue in the throat (pharynx). | Located in the throat and at the back of the tongue. | · Trap and destroy bacteria and other pathogens entering the throat. |
| Peyer’s Patches | Part of gut-associated lymphoid tissue (GALT). | Located in the lining of the small intestine. | · Monitor and respond to pathogens and antigens in the digestive tract. |
| Appendix | A small, finger-like projection of lymphoid tissue attached to the cecum in the large intestine. | Located in the lower right abdomen. | · May play a role in immune function, including defense against infections in the gastrointestinal tract. · Though its exact function is not fully understood. |