Lymphoid tissue #WikiDentia

Q1. One function carried out by all lymphoid tissues and organs is

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(A) Filtration of lymph

(B) Filtration of blood

(C) Production of lymphocytes

(D) Destruction of old erythrocytes

(E) Extramedullary erythropoiesis

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Q2. Effectors cell types derived from T-lymphocytes include

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(A) Helper cells

(B) Suppressor cells

(C) Cytotoxic cells

(D) Memory cells

(E) All of the above choices

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Q3. B-lymphocytes are the major lymphocyte type found in all of the following locations EXCEPT

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(A) Peyer's patches

(B) Palatine tonsils

(C) Circulating blood

(D) White pulp of the spleen

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Q4. Antibodies are produced by

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(A) T-lymphocytes

(B) B-lymphocytes

(C) Plasma cells

(D) Null cells

(E) All of the above choices

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Q5. All of the following structures are at least partially enclosed by a C.T capsules EXCEPT

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(A) Spleen

(B) Tonsil

(C) Solitary lymph nodule

(D) Thymus

(E) Lymph node

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Q6. Antigen presenting cell Include all the following EXCEPT

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(A) Kupffer cell of the liver

(B) Follicular dendritic cells of the lymph node

(C) Langerhan's cells of the skin

(D) T-lymphocytes

(E) Dendritic cells of the paracortical zone of the lymph node

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Q7. Epithelial reticular cells are present In

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(A) Spleen

(B) Bone marrow

(C) Lymph node

(D) Tonsil

(E) Thymus

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Q8. Mesenchymal reticular cells are present in the following structures EXCEPT

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(A) Lymph node

(B) Spleen

(C) Thymus

(D) Bone marrow

(E) Tonsil

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Q9. Lymph nodes have

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(A) Afferent lymphatic vessels that enter the cortex of the node

(B) Efferent lymphatic vessels that leave the node via the hilus

(C) A cortical zone

(D) A medullary zone

(E) All of the above choices

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Q10. Which of the following statements about lymph node is NOT correct

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(A) Reticular fibers are one of constituents of the stroma of the organ

(B) Lymph nodes can be identified histologically by the presence of subcapsular sinus

(C) The postcapillary venules are lined with simple squamous epithelium

(D) Blood vessels enter and leave the lymph node at the hilus

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Q11. Paracortical zone of the lymph node is characterized by the following EXCEPT

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(A) Lies between the cortical lymphoid nodule and medulla

(B) Contains mainly B lymphocytes

(C) Has high endothelial postcapillary venules

(D) It contains mainly T lymphocytes

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Q12. Indicate the order in which lymph passes through the sinuses of lymph node

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(A) Subcapsular → medullary - peritrabecular

(B) Medullary → subcapsular peritrabecular

(C) Medullary→ peritrabecular + subcapsular

(D) Subcapsular → peritrabecular → medullary

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Q13. In the spleen, all the following statements are True EXCEPT

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(A) The blood sinusoids of the red pulp are lined with elongated endothelial cells

(B) The periarterial lymphatic sheath are rich with T-lymphocytes

(C) The lymphoid nodules are located in the cortex

(D) Has a marginal zone rich with macrophages and dendritic cells

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Q14. Central arterioles of the spleen

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(A) Are found in the red pulp

(B) Are found in the white pulp

(C) Possess ellipsoids

(D) Are the main splenic filter of bacteria and foreign particles

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Q15. The region between cortex and medulla in the lymph nodes is supplied by special vessel called

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(A) Afferent lymphatic vessels

(B) Efferent lymphatic vessels

(C) Post-capillary venules

(D) Penicellar artery

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Q16. Each of the following statements about the epithelial reticular cells of the thymus Is True EXCEPT

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(A) They are derived from embryonic endoderm

(B) They are structural components of blood thymus barrier

(C) They attach to each other by desmosomes

(D) They are structural components of Hassal's corpuscle

(E) They synthesize and secrete cytokines

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Q17. Each of the following statements about the thymic cortex is correct EXCEPT

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(A) It is the site of the blood thymus barrier

(B) It is the region in which T-lymphocytes maturation occur

(C) It contains Hassal's corpuscle

(D) Its epithelial reticular cells secrete thymosin and thymopoitin

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Q18. In the medullary zone of the thymus you can find

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(A) Central arterioles

(B) Hassal's corpuscle

(C) Lymphatic nodules

(D) Less epithelial reticular cells and more lymphocytes

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Q19. Hassal's corpuscles of the thymus

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(A) Are found in the cortex of young individuals

(B) Are found in the cortex of old individuals

(C) Are found in the medulla of old individuals

(D) Are derived from ectoderm

(E) Are derived from mesoderm

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Q20. The blood thymus barrier Is formed of

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(A) None fenestrated capillary endothelium

(B) Thick basal lamina

(C) Epithelial reticular sheath

(D) All of the above

(E) None of the above

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Q21. Thymopoletin and thymosin hormones are secreted by

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(A) T-helper lymphocytes

(B) Plasma cells

(C) Epithelial reticular cells of the thymus

(D) B-memory lymphocytes

(E) T-memory lymphocytes

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Q22. Which of the following is known as a thymus-dependent region of a peripheral lymphoid organ

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(A) Medullary cords of lymph node

(B) Paracortical area of the lymph node

(C) Crypts of pharyngeal tonsils

(D) Periarterial lymphatic sheaths of the spleen

(E) Germinal centers of Peyer's patches

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Q23. The periarterial lymphatic sheath of the spleen

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(A) Are associated with the trabecular arteries

(B) Are components of the splenic cord

(C) As part of the white pulp

(D) Rich with B-lymphocytes

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Q24. Unusual high endothelial cells are found In the

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(A) Cortex of the lymph node

(B) Paracortex of the lymph node

(C) Cortex of the thymus

(D) Red pulp of the spleen

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Q25. T-helper cells

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(A) Can assist only T-lymphocytes

(B) Never assist B-lymphocytes

(C) Are memory cells

(D) Produce lymphokines

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