Exam 3: Lymphatic System Flashcards Preview

Anatomy A-215 > Exam 3: Lymphatic System > Flashcards

Flashcards in Exam 3: Lymphatic System Deck (30):
1

Capillary Level

-fluids pushed out of vessels and into tissues

2

Interstitial Fluid

-fluid within tissues
-venules pick up most, but not all of this fluid

3

Lymph

-interstitial fluid picked up by lymphatic system

4

Lymphatic System (consists of)

-consists of lymph vessels and lymphatic tissues and organs

5

Functions of Lymphatic System

-absorbs dietary lipids and fat-soluble vitamins (A, D, E, K)
-returns interstitial fluid back into blood stream (done by lymph vessels)
-initiates an immune response when mecessary (done by lymphatic tissues/organs)

6

Lymph Vessels (system)

-low pressure system

7

Lymphatic Capillaries

-smallest lymph vessel
-wall composed of endothelium (simple squamous)
-walls have 1-way flaps which allow lymph to enter but not escape

8

Lacteals

-lymphatic capillaries in small intestine
-function absorb dietary fats

9

Lymphatic Vessels (characteristics)

-like veins, have 3 tunics
-have valves which prevent backflow
-take lymph to and from lymph nodes

10

Lymphatic Trunks

-formed from merging lymphatic vessels
-drain into lymphatic ducts

11

Lymphatic ducts

-Right Lymphatic Duct
-Thoracic Duct

12

Right Lymphatic Duct

-receives lymph from right side of head, neck and thorax, right upper limb
-drains into right subclavian vein

13

Thoracic Duct

-receives lymph from left side of head, neck, thorax, left upper limb, entire abdomen, left and right lower limbs
-drains into left subclavian vein

14

Lymphedema

-buildup of interstitial fluid due to lymph vessel damage
-causes: surgery that removes lymph vessels (eg for breast cancer), cancer spread, infection from parasitic worms (filarial worms)

15

Pathway of Lymph

-lymphatic capillaries-->lymphatic vessels-->lymphatic trunks-->lymphatic ducts-->venous circulation

16

Lymphatic Cells

-start and produce immune response when exposed to antigens

17

Antigens

-anything perceived as foreign in the body

18

Lymphocytes

-T-lymphocytes (T-cells)
-B-lymphocytes (B-cells)

19

T-Lymphocytes

-mature in thymus
-functions: some of these cells manage/direct an immune response, while others directly attack cells
-general/soldiers

20

B-Lymphocytes

-mature in red bone marrow
-function: many secrete antibodies which attach to antigens and immobilize them until another cell destroys antigen
-handcuffs

21

Macrophages

-monocytes that migrated from bloodstream into other tissues
-function: phagocytize foreign substances

22

Lymphatic Structures

-not organs
-consists of connective tissue containing lots of lymphatic cells
-not surrounded by CT capsule

23

Lymphatic Nodules

-main type of lymphatic structures
-clumps of lymphatic cells within other organs
-ex: tonsils in pharynx, MALT (Mucosa Associated Lymphatic Tissue) in walls of GI and respiratory tract
-both respond to antigens

24

Lymphatic Organs

-lymphatic structures surrounded by connective tissue capsule

25

Thymus

-behind sternum
-function: T-lymphocytes mature and differentiate here. this happens prior to adult hood
-adult thymus is non functional

26

Lymph Nodes

-tiny oval organs
-hundreds
-found in clusters
-connect with lymphatic vessels
-functions: filter lymph, activate immune response if antigens found in lymph
-infection: lymph nodes become swollen and tender

27

Cancer Spread and Lymph Nodes

-cancer can spread through lymph vessels and lymph nodes
-cancerous lymph nodes tend to be hard and nontender

28

Spleen

-largest lymphatic organ in body
-located in upper left abdomen, behind and lateral to stomach
-red pulp and white pulp
-functions: does NOT filter lymph, it filters blood

29

Red Pulp

-splenic sinusoids (large capillaries) and splenic cords
-contains erythrocytes, platelets and macrophages
-function: removes old erythrocytes and platelets
-graveyard for erythrocytes

30

White Pulp

-lymphocytes
-will start an immune response if antigens found in blood