The Lymphoid System

Question 1

Primary Lymphoid Organs

Answer 1

Bone Marrow
Thymus

Question 2

It can be considered the largest tissue of the body, with a total weight of 1300 to 1500g in adult

Answer 2

Bone Marrow

Question 3

Site where most blood cells mature including B cells and NK cells.

Answer 3

Bone Marrow

Question 4

a small, flat, bilobed organ found in the thorax, or chest cavity, right below the thyroid gland and overlying the heart

Answer 4

Thymus

Question 5

Site where T cells mature and develop their identifying characteristics.

Answer 5

Thymus

Question 6

Not fully mature T cells = resides in the

Answer 6

Cortex

Question 7

Mature T cells = resides in the

Answer 7

medulla and then released

Question 8

Secondary Lymphoid Organs

Answer 8

Spleen
Lymph Nodes

Question 9

act as the site for antigen-dependent lymphopoiesis

Answer 9

secondary lymphoid organs

Question 10

makes up more than one half of the total volume of the splenic tissue, and its function is to destroy RBCs

Answer 10

Red pulp

Question 11

Main type of spleen that contains lymphoid tissue

Answer 11

White pulp

Question 12

In the spleen, Contains mainly T cells

Answer 12

PALS (periarteriolar lymphoid sheaths)

Question 13

contains naïve B cells

Answer 13

Primary follicles

Question 14

In the white pulp of the spleen it contains dendritic cells

Answer 14

Marginal zone

Question 15

are located along lymphatic ducts and serve as central collecting points for lymph fluid from adjacent tissues.

Answer 15

Lymph nodes

Question 16

act as lymphoid filters in the lymphatic system.

Answer 16

Lymph Nodes

Question 17

respond to antigens introduced distally and routed to them by afferent lymphatics

Answer 17

Lymph Nodes

Question 18

contains macrophages, follicular dendritic cells, naïve or resting B cells (in primary follicle), proliferating B cells and plasma cells (in 2ndary follicles or Germinal centers)

Answer 18

Cortex

Question 19

Layer of lymph node that contains mainly T cells

Answer 19

Paracortex

Question 20

Layer of the lymph node that contains T cells, B cells, plasma cells, and macrophages

Answer 20

Medulla

Question 21

The ___ populate the following:

1. Perifollicular and paracortical regions of the lymph nodes
2. Medullary cords of the lymph nodes
3. Periarteriolar regions of the spleen
4. Thoracic duct of the circulatory system

Answer 21

T lymphocytes or T cells

Question 22

The ______ multiply and populate the following:

1. Follicular and medullary (germinal centers) of the lymph nodes
2. Primary follicles and red pulp of the spleen
3. Follicular regions of GALT
4. Medullary cords of the lymph nodes

Answer 22

B lymphocytes or B cells