Lymphoid I

Question 1

T cells

Answer 1

responsible for cell mediated immunity

Question 2

B cells

Answer 2

responsible for humoral immunity

Question 3

starry sky appearance

Answer 3

in the thymus due to the macrophages removing the thymocytes

Question 4

thymotaxin

Answer 4

produced by epithelial cells to migrate from bone marrow to thymus

Question 5

epithelial reticular cells

Answer 5

in the thymus, connected by desmosomes, present antigens to immature T cells, no reticular fibers

Question 6

thymosin and thymopoieten

Answer 6

thymic hormones

Question 7

Which cells contribute to the blood thymus barrier

Answer 7

ERCs

Question 8

Where do immunocompetent T cells exit the thymus?

Answer 8

thick endothelium of the medulla

Question 9

Hassal corpuscles

Answer 9

concentric layers of epithelial cells in the medulla of the thymus

Question 10

thymic stromal lymphopoietin (TLSP)

Answer 10

stimulates the differentiation of regulatory T cells

Question 11

Parenchyma of the thymus is replaced with what during involution?

Answer 11

adipose tissue

Question 12

MALT

Answer 12

mucosa associated lymphoid tissue

Question 13

nodular lymphoid tissue

Answer 13

where B cells recognize antigen in secondary lymphoid organs, supported by reticular fibers

Question 14

diffuse lymphoid tissue

Answer 14

where T cells are activated in the thymus

Question 15

germinal center

Answer 15

location of B cell activation and initial differentiation

Question 16

palatine tonsil (paired)

Answer 16

stratified squamous epithelium, lateral walls of the fauces

Question 17

pharyngeal tonsil (single)

Answer 17

pseudostratified ciliated columnar epithlium, posterior wall of the nasopharynx

Question 18

lingual tonsil (multiple)

Answer 18

stratified squamous epithelium, posterior tongue

Question 19

peyer patch

Answer 19

in the intestinal muscosa and submucosa, nodules and diffuse lymphoid tissue for antigen sampling

Question 20

M cells

Answer 20

speicialized epithelial cells that form pockets and allow lymphocytes to sample antigen

Question 21

functions of appendix

Answer 21

reserve of gut flora, endocrine role, immune surveillance