Chapter 28: Lymphatic System Flashcards Preview

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Flashcards in Chapter 28: Lymphatic System Deck (49)
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31

what is M.A.L.T

(Mucosa associated lymphoid tissue)
Digestive lymph nodules

32

where are tonsils positioned and what do they do?

-Positioned around the pharanx
-Remove pathogens that enter via air or food

33

what are the three types of tonsils? describe

1.) Pharyngeal tonsil
-one nodule in nasophranx
-a.k.a. adenoids
2.) Palatine tonsils
-two nodules on the soft palate
3.) Lingual tonsils
-two nodules at the base of the tongue

34

what MALT lines mucosa of the small intestine

Aggregated lymphoid nodules

35

what is the appendix?

Blind tube at the beginning of small intestine
Area prone to infection
-Appendicitis
-Intestinal flora enter underlying tissues

36

lymphatic organs are surrounded by.....

a fibrous, connective tissue capsule

37

what are the three lymphatic organs?

Thymus
Spleen
Lymph Nodes

38

describe lymph nodes (3)

-bean shaped
-Between several afferent and one efferent vessel
-Hilus
(indented region where BV’s, nerves, and efferent lymph vessels connect)

39

lymph nodes have a cortex and medulla.. describe both sections

Cortex:
-capsule has trabeculae that subdivide it
Has two regions:
outer cortex
(consists of aggregated B-cells)
inner cortex
(T cells enter blood here)

Medulla:
B-cells leave through the efferent vessel

40

what are the 6 locations of lymph nodes?

Cervical
Axillary
Inguinal
Pelvic
Abdominal
Thoracic

41

Where is the spleen located?

the left side of the stomach

42

True or False: the spleen is the largest lymphatic organ

true

43

the spleen is made up of 2 types of pulp... what are they and describe them

White pulp
-resembles lymph node
Red pulp
-large amounts of RBC
-sinuses, macrophages, T/B cells

44

what are the functions of the spleen? (5)

Remove old RBC’s
Store/recycle iron
Initiate immune response
Blood reservoir
RBC production in fetus

45

where is the thymus located?

in mediastium

46

describe the size and development of the thymus over time as you age

first lymph organ to develop
grows until puberty
Shrinks with age
replaced by fibrous & adipose tissue

47

the thymus has 2 lobes with lobules. what are they?

Cortex-mostly immature T-cells
Medulla-mostly reticular epithelial cells

48

describe the T cells in the thymus

Cortex produces T-cells
Mature and migrate into medulla
Enter blood vessels and go into circulation

49

describe reticular cells in the thymus

Produce thymosin
Promote T-cell differentiation