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Flashcards in LYMPHATIC Deck (87)
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1

lymph, lymphocytes, lymphatic vessels, lymph nodes, tonsils, spleen, thymus
-does not circulate fluid to and from tissues
-carries fluid in one direction, from tissues to circulatory system
-most fluid returns to blood, some move into lymphatic capillaries to become lymph

lymphatic system

2

tiny, close-ended vessels consisting of simple squamous epithelium
-more permeable than blood capillaries because they lack a basement membrane
-its overlapping squamous cells act as valves (prevent backflow of fluid)
-present in most tissues except CNS, bone marrow, tissues without blood vessels (epidermis & cartilage)
-join to form lymphatic vessels

lymphatic capillaries

3

resemble small veins
-small LV have beaded appearance because they have one-way valves
-when compressed, valves prevent backward movement, causing lymph to move forward
-converge and empty into the blood at two locations:

lymphatic vessels

4

– tonsils, lymph nodes, spleen, thymus

LYMPHATIC ORGANS

5

– lymphocytes and other cells

LYMPHATIC TISSUE

6

form a protective ring of lymphatic tissue around the openings between the nasal and oral cavities and pharynx
-protect against pathogens and other potentially harmful material entering from the nose and mouth

tonsils

7

form interlaced network that holds the lymphocytes and other cells in place
-traps microorganisms and other items in the fluid when lymph or blood filters through lymphatic organs

reticular fiber

8

iginate from red bone marrow and are carried by blood to lymphatic organs
-divide and increase in number when the body is exposed to microorganisms or foreign substances

lymphocytes

9

posterior opening of the oral cavity, “the tonsils”

PALATINE

10

– near the internal opening, called adenoids when enlarged

PHARYNGEAL

11

posterior surface of the tongue

3. Lingual

12

rounded structures
-distributed along various lymphatic vessels
-where lymph passes before entering the blood

LYMPH NODES

13

3 Superficial Aggregations of Lymph Nodes on each side of the body

1. Inguinal nodes – groin
2. Axillary nodes – axilla
3. Cervical nodes – neck

14

– dense CT surrounding each node

CAPSULE

15

subdivide a lymph node into compartments containing lymphatic tissue and sinuses

Trabeculae

16

dense aggregations of tissue

LYMPH ATIC NODULES

17

spaces between lymphatic tissue containing macrophages

LYMPH ATIC sinuses

18

– lymphatic nodules containing rapidly dividing lymphocytes

germinal; centers

19

– clenched fist, left, superior corner of the abdominal cavity
-outer capsule of dense CT and some smooth muscle
-divided into compartments by trabeculae
-filters blood instead of lymph
-detect and respond to foreign substances in the blood & destroy worn-out rbc
-blood reservoir (used in emergency situations, little blood only)

spleen

20

part of spleen
lymphatic tissue surrounding arteries within the spleen

white pulp

21

– associated with veins
-a fibrous network filled with macrophages and RBC, enlarged capillaries connecting to veins

red pulp

22

-bilobed gland, triangular in shape
-in superior mediastinum
-each lobe surrounded by capsule
-divided into lobules by trabeculae
-site for maturation of T cells

thymus

23

– near the capsule and trabeculae
-dark-staining areas formed by numerous lymphocytes

cortex

24

– lighter-staining central portion with fewer lymphocytes

medulla

25

-ability to resist damage from foreign substances, harmful chemicals and internal threats

IMMUNITY

26

body recognizes and destroys certain foreign substances
-response is same each time the body is exposed

INNATE IMMUNITY

27

– body recognizes and destroys foreign substances
-response improves each time the foreign substance is encountered

ADAPTIVE IMMUNITY

28

ability of adaptive immunity to recognize a particular substance

SPECIFICITY

29

ability of adaptive immunity to remember previous encounters with a particular substances

MEMORY

30

INNATE IMMUNITY WHICH prevent microorganisms and chemicals from entering the body in 2 ways:

PHYSICAL BARRIERS

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