Lymphatic System - Histo

Question 1

What are the three major functions of the Lymphatic System?

Answer 1

drain excess interstitial fluid to return blood to maintain blood volume
immune response
provide an alternative transportation route for hormones, nutrients and waste

Question 2

What are the seven components of the lymphatic system?

Answer 2

1. diffuse lymphatic tissue
2. lymph nodules
3. lymph nodes
4. spleen
5. bone marrow
6. thymus
7. lymphatic vessels

Question 3

What is the definitive cell of the lymphatic system?

Answer 3

lymphocyte

Question 4

What are three types of lymphocytes?

Answer 4

B cells, T Cells and NK cells

Question 5

Which cell differentiate in the thymus, attach and destroy cells, are involved with cell-mediated immunity, and make up 60 - 80% of circulating lymphocytes?

Answer 5

T cells

Question 6

What cell was first recognized in the bursa of Fabricius in birds, produce and secrete antibodies, are involved in humoral immunty and make up 20 - 30% of circulating lymphocytes?

Answer 6

B cells

Question 7

___ ___ cells kill certain transformed cells and make up 5 - 10% of circulating lymphocytes.

Answer 7

Natural Killer

Question 8

What tissue type has an accumulation of lymphocytes in the lamina propria of the alimentary canal, respiratory, urinary, and reproductive tracts?

Answer 8

diffuse lymphatic tissue

Question 9

Diffuse lymphatic tissue has no surrounding ___ and houses ___ cells and ___.

Answer 9

capsule; plasma; eosinophils

Question 10

Lymphatic nodules have no surrounding ___, are sharply defined, contain a meshwork of ___ fibers and have lymphocytes, plasma cells and eosinophils.

Answer 10

capsule, reticular

Question 11

A secondary nodule has a ___ center with follicular ___ cells and a ___ zone.

Answer 11

germinal; dendritic; mantle

Question 12

What is an aggregate of primarily small lymphocytes?

Answer 12

primary nodule

Question 13

T/F. Normally, lymphatic nodules are found grouped together however in certain areas of the alimentary canal they are found randomly dispersed and my themselves.

Answer 13

False, Normally, lymphatic nodules are found randomly dispersed and by themselves however, in certain locations of the alimentary canal they are grouped together.

Question 14

Give two examples of aggregated lymphatic nodules.

Answer 14

1. Tonsils

2. Peyer’s patches

Question 15

Which aggregated lymphatic nodule is found in the ileum?

Answer 15

Peyer’s patches

Question 16

___ create a ring around the entrance to the oropharynx and the nasopharynx.

Answer 16

Tonsils

Question 17

Where would you find lymph nodes and what is the function?

Answer 17

capsuled organs along pathways of lymphatic vessels
function to filter system

Question 18

What three areas of the lymph node make up the stroma?

Answer 18

capsule, trabeculae, and reticular tissue/meshwork

Question 19

What parts make up the lymph node’s parenchyma?

Answer 19

cortex and medulla

Question 20

Where are the germinal centers of a lymph node located?

Answer 20

Cortex - superficial (nodular) cortex - lymphatic nodules - secondary area

Question 21

The ___ can be divided into the cords and sinuses.

Answer 21

medulla

Question 22

What are the four cells of the reticular meshwork?

Answer 22

reticular cells, dendritic cells, macrophages, and follicular dendritic cells

Question 23

List the flow of lymph through the lymph node.

Answer 23

afferent lymph vessel - subcapsular (cortical) sinus - trabecular sinus - medullary sinus - efferent lymph vessels

Question 24

The thymus is the site of thymic cell ___, a process through which T cells mature and differentiate into immunocompetent T cells.

Answer 24

education

Question 25

What is the function of the spleen?

Answer 25

it filters and monitors the blood immunologically

Question 26

The ___ pulp of the spleen consists of blood-filled venous sinuses surrounded by cords of splenic tissue called splenic (___) cords, that contain RBCs, macrophages, lymphocytes, plasma cells, and granulocytes.

Answer 26

red; Billroth’s

Question 27

What is the function of the red pulp?

Answer 27

blood filtration (removal of materials, antigens, and worn-out or defective RBCs, WBCs, and platelets)

Question 28

White pulp consist mostly of ___ that aggregate around branches of the splenic ___ (called ___ ___) creating ___ ___ ___ (PALS).

Answer 28

lymphocytes; artery; central arteries; periarterial lymphatic sheaths

Question 29

What is the function of the white pulp?

Answer 29

To carry out immune functions similar to lymph nodes