Organs Of The Immune System

Question 1

What immunity is mediated by lymphocytes found within lymphoid organs?

Answer 1

Adaptive immunity

Question 2

What is it called when an immune system attacks itself?

Answer 2

Autoimmune

Question 3

What is the role of lymphocytes when they reside in secondary lymphoid organs?

Answer 3

Encounter and respond to foreign antigens

Question 4

What are the major secondary lymphoid organs?

Answer 4

Lymph nodes, spleen, bone marrow, tonsils, and peyer’s patches within intestines

Question 5

What are the primary lymphoid organs?

Answer 5

Thymus, bursa, peyer’s patches, and bone marrow

Question 6

What is the role of the primary lymphoid organs?

Answer 6

Develop lymphocytes

Question 7

What is the ectododermal junction or endoderm the origin of?

Answer 7

Primary lymphoid organs

Question 8

What is the time of development for the primary lymphoid organs?

Answer 8

Early in embryonic life

Question 9

What happens when you remove a primary lymphoid organ?

Answer 9

Loss of lymphocytes

Question 10

What type of response to an antigen is produced by primary lymphoid organs?

Answer 10

Unresponsive

Question 11

What is the origin of secondary lymphoid organs?

Answer 11

Mesoderm

Question 12

When are secondary lymphoid organs developed?

Answer 12

Late in fetal life

Question 13

What is the effect of removing secondary lymphoid organs?

Answer 13

No or minor effects

Question 14

What type of response do secondary lymphoid organs have to antigens?

Answer 14

Full response

Question 15

Where is the thymus located?

Answer 15

Cranial thoracic cavity

Question 16

What does the thymus produce?

Answer 16

Hormones

Question 17

As you age, what happens to the number of lymphocytes?

Answer 17

They decrease

Question 18

If you remove an animals thymus, what happens to the thymic hormones?

Answer 18

Decrease in hours

Question 19

If you remove an animals thymus, what happens to the blood t cells?

Answer 19

Decrease in 1 week

Question 20

If you remove an animals thymus, what happens to the spleen t cells?

Answer 20

Decrease in 1 month

Question 21

If you remove an animals thymus, what would happen if the animal had a skin graft surgery?

Answer 21

The animals immune system would not reject it as it would if the animal had it’s thymus

Question 22

If you remove an animals thymus, what happens to the antibodies?

Answer 22

They decrease slightly

Question 23

What are 2 examples of congenital athymic animals?

Answer 23

Nude mouse and Mexican hairless dog

Question 24

Why do hairless rats skin grafts survive if the don’t have a thymus?

Answer 24

There is no cellular immune response to reject the graft

Question 25

What is an example of a primary lymphoid tissue of a chicken?

Answer 25

Bursa of Fabricius

Question 26

What is the main effect of a thymectomy?

Answer 26

Decrease in cellular immune response

Question 27

What is the major effect of a bursectomy?

Answer 27

Decrease in antibodies

Question 28

What are group 1 animals that have Peyer’s patches?

Answer 28

Ruminants, pigs, horses, dogs, humans

Question 29

What are group 2 animals that have Peyer’s patches?

Answer 29

Primates, rabbits, rodents

Question 30

For group 2 animals, what is probably the source of B cells?

Answer 30

Bone marrow

Question 31

Do lymphocytes mature in organs?

Answer 31

No

Question 32

What system is made of open-ended vessels that return extravascular fluid from the periphery to the heart and blood?

Answer 32

Lymphatic system

Question 33

What are distributed throughout the lymphatics that act as series of small filtering stations?

Answer 33

Lymph nodes

Question 34

What is the main job of the dendritic cells?

Answer 34

Present pathogen to t and B cells to develop an immune response

Question 35

What secondary lymphoid tissue has a high presence of dendritic cells?

Answer 35

High endothelial venule

Question 36

Why is bone marrow the secondary immune response after a vaccine?

Answer 36

Some cells differentiate memory cells which migrate and survive in the bone marrow

Question 37

Where is the primary immune response after a vaccine?

Answer 37

Lymph node or spleen

Question 38

What does MALT stand for?

Answer 38

Mucous-associated lymphoid tissue

Question 39

If a cat has a skin infection on its paws, what lymph node will likely be swollen?

Answer 39

Axillary

Question 40

What arises from bone marrow stem cells?

Answer 40

All lymphocytes