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Physiology Lecture > Lymphatic System > Flashcards

Lymphatic System Flashcards

1
Q

Purpose of Lymphatic System

A

returns fluid leaked from blood vessels back to the blood vessels

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2
Q

3 Parts of the Lymphatic System

A

Lymphatic vessel, lymph fluid, lymph node

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3
Q

Lymphoid organs

A

spleen, thymus, tonsils, MALT, peyers patches, appendix, red bone marrow

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4
Q

Lymphatic vessels

A

inersitial fluid enters where it changes to lymph fluid, unidirectional flow

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5
Q

intersitial fluid

A

when fluid exits blood vessels and washes around the tissues

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6
Q

Flow of lymph fluid

A

lymphatic capillary to lymphatic collectiong vessels to node to trunk to duct and back to blood vessels

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7
Q

Lymphatic Capillaries

A

very permeable due to overlapping endothelial cells that form valve flaps in the walls of vessels

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8
Q

Function of Lymphatic Capillaries

A

drain fluid, proteins, pathogens, debris, and cancer cells

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9
Q

Lacteals

A

set of specialized capillaries

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10
Q

Lacteal Function

A

absorb digested fats from intestine, turning the clear lymph fluid into milky fluid called Chyle

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11
Q

Location of Lacteals

A

villi of intestinal mucosa

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12
Q

Where are not capillaries not found?

A

bones, teeth, bone marrow, CNS

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13
Q

Collecting vessels

A

have 3 tunics, thinner walls, more valves, anastomose

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14
Q

Superficial Vessels

A

in skin, travel with veins

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15
Q

deep vessels

A

of the trunk, travels with arteries

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16
Q

Lymphatic Trunks

A

collecting vessels fuse to form trunks

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17
Q

5 lymphatic trunks

A

lumbar, subclavian, jugular, intestinal

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18
Q

Lymphatic duct

A

2 large ducts in thoracic region

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19
Q

right lymphatic duc

A

drains lymph from right side of head and throrax + arm

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20
Q

thoracic duct

A

much larger and drains lymph from rest of the body. often formed from an enlarged sac, the cistera chyli

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21
Q

Lymph Clusters

A

neck, shoulder, groin

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22
Q

Transport of lymph

A

no pump + low pressure=sporadic flow

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23
Q

What does the flow of lymph depend on?

A

skeletal and respiratory muscles, valves prevent backflow, pulsating action of adjacent arteries

24
Q

Lymphedema

A

lymphatic obstruction, localized fluid retention and tissue swelling

25
Q

Lymph Nodes

A

cluster along lymphatic vessels where they merge to form trunks

26
Q

two functions of lymph nodes

A

filter microorganisms and debris from lymph, activate immune system

27
Q

structure of lymph node

A

1” bean, surrounded by fibrous capsule, trabeculae divide node into compartments

28
Q

Outer cortex of lymph node

A

t-cells temporarily rest here

29
Q

Medullary Cords

A

cortex things and tissues form extensions

30
Q

Lymph Sinus

A

found throughout nodes, house macrophages

31
Q

Lymph flow through nodes

A

lymph to vessels to subscabular sinus to smaller sinus in cortex flowing over RF, cleaning to exiting the node at the hilus via efferent vessels to blood stream

32
Q

lymphoid tissues

A

scattered around in body and organs and connective tissue

33
Q

tissue type of lymphoid tissue

A

reticular

34
Q

function of lymphoid tissue

A

to protect the body
1. proliferation site for hypothesis
2. ideal surveillance point for lymphocytes and macrophages

35
Q

macrophages

A

live on reticular fibers

36
Q

lymphocytes

A

circulate between blood system and reticular tissue

37
Q

spleen (7)

A

largest, site of lymphocyte proliferation, immune surveillance, removes aged and defective blood cells and platelets, houses macrophages

38
Q

how does the spleen cleanse the blood?

A

removes aged and defective blood cell and platelets

39
Q

what is stored in the spleen?

A

stores breakdown products of RBC for later use

40
Q

structure of spleen

A

outer fibrous capsule, trabeculae externs inwards, white pulp, red pulp

41
Q

white pulp

A

lymphocytes, found around branches of arteries

42
Q

red pulp

A

rest of splenic tissue, disposal of debris

43
Q

thymus

A

lower neck, most active in childhood, immunocompetent t-cells

44
Q

outer cortex of the thymus

A

densely packed, dividing t lymphocytes

45
Q

inner medulla of thymus

A

thymic corpuscles- degenerating cells

46
Q

function of the thymus

A

t-lymph maturation, thymocytes, thymosin and thymopoietin

47
Q

Tonsils

A

simplests, in pairs

48
Q

palatine tonsils

A

posterior oral cavity, largest and often infected

49
Q

lingual tonsil

A

base of tongue

50
Q

pharyngeal tonsil

A

posterior wall of nasopharynx

51
Q

tubal tonsil

A

surround eustachian tube, smallest

52
Q

function of tonsils

A

epithelium folds inward to form crypts that trap bacteria, move into lymphoid tissues and destroy it

53
Q

peyers patch’s

A

wall of ileim

54
Q

appendix

A

sample of bacteria in GI system

55
Q

MALT

A

mucosa-associated lymphatic tissue

Physiology Lecture (10 decks)

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