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Flashcards in Lymphatic System Deck (46):
0

What is the lymphatic system?

Complex network of lymphatic vessels, lymph nodes & other lymphoid tissue

1

What does the lymphatic system provide?

Return to the circulation for fluid that has leaked from capillary blood into the surrounding tissue

2

What is the name of the fluid that is found in the tissue?

Lymph fluid

3

What does lymph fluid contain?

Lymphocytes (white blood cells)

4

What do lymphocytes play a role in?

Immunity

5

What are the principle functions of the lymphatic system?

Bathe cells deep within tissue, providing nutrients.
Maintain fluid balance between plasma & interstitial fluid.
House lymphocytes.
Allow the absorption of fatty acids from the gut (into lacteals)

6

Where is the cervical lymph node located?

Neck

7

Where does the lymphatic thoracic duct enter?

Left subclavian vein

8

Where does the right lymphatic duct enter?

Right subclavian vein

9

Where are the axillary lymph nodes located?

Armpits

10

Where is the lymphatic thoracic duct located?

Bottom of thoracic cavity

11

What is the cisterna chyli?

Lymph junction to the legs

12

Where r the inguinal lymph nodes located?

Groin

13

What are the principle lymphatic vessels?

Thymus & spleen

14

Where are lymph nodes located?

Near main arteries

15

Where is lymph formed?

Capillary beds as blood flows through capillaries

16

Why does fluid tend to leave the blood & enter the interstitial space?

Due to relative pressure in blood vessels

17

What part of the capillary beds does the lymph tend to leave in?

Arterial part

18

Where does lymph tend to return to the blood?

Venous part

19

Even when plasma protein levels are normal how foes the fluid act?

More fluid leaves the blood than re-enters

20

What happens to the excess fluid in the tissue?

Drains into tiny blind ended vessels called lymphatic capillaries

21

What is the fluid that drains into lymphatic capillaries called?

Lymph (clear, colourless)

22

Why is lymph similar to plasma?

Electrolyte compsition

23

What does lymph contain very little of?

Protein

24

Define lymphatic circulation and how it works?

Tiny blind ended lymphatic capillaries drain into larger lymphatic vessels which run alongside major veins and carry lymph back to the blood

25

What is lymph travelling towards a lymph node called?

Afferent lymphatics

26

What is lymph travelling away from a lymph node called?

Efferent lymphatics

27

Why does the lymphatic system have valves?

Prevent backflow of lymph

28

What two lymphatic ducts drain back into the subclavian veins?

Thoracic & cervical ducts

29

What happens if lymph vessels are blocked or damaged?

Tissue can become oedematous & swollen (lymph-oedema)

30

How many lymph nodes does the lymphatic system consist of?

Around 500 lymph nodes (swellings)

31

What does the lymphoid tissue house?

Lymphocytes

32

What size is a lymph node?

1mm - 25mm in length

33

Where does lymph draining pass through before returning to the blood?

Lymph nodes

34

What are the regions that nodes are organised in called?

Follicles

35

What do the lymph nodes house?

B-lymphocytes & memory cells

36

What are found in large numbers between lymphatic follicles?

T-lymphocytes

37

Why does the lymph percolate through the node tissues?

So that any pathogens are exposed to lymphocytes in the node

38

What is the purpose of the lymphocytes in the nodes?

To mount an appropriate immune response

39

Where else do lymphocytes go?

Leave nodes via efferent lymph & return to circulation

40

What is the purpose of lymphocytes entering the blood stream?

So the body is continuously patrolled by immune cells

41

What are the secondary lymphoid tissues in the body?

Tonsils & adenoids, lymph nodes, spleen, peyers patches,

42

In the lymphatic system, what does older tissue house?

Large numbers of lymphocytes

43

What are the primary lymphoid?

Bone marrow & thymus

44

Where do b lymphocytes mature?

Bone marrow

45

Where do t lymphocytes mature?

Thymus gland