A&P - Chapter 31 (Part 1)

Question 1

What are the functions of the lymphatic system? (3)

Answer 1

1. Maintain fluid balance in the body
2. Plays a role in immunity
3. Fat absorption and transport

Question 2

What are the 6 structures of the lymphatic system?

Answer 2

1. Lymph
2. Lymphatic vessels
3. Lymph nodes
4. Thymus
5. Tonsils
6. Spleen

Question 3

What is the fluid called when it goes from cell to tissue?

Answer 3

Interstital fluid

- filters out of capillaries into tiny spaces between cells and tissues

Question 4

What is lymph fluid?

Answer 4

Is excess if it was absorbed by tissue cells or reabsorbed by the blood before it flows out of the tissue, drains into the lymphatic capillaries
- considered dirty

Question 5

Where does lymph go?

Answer 5

It is drained back into the venous blood and back to the heart

Question 6

What do lymphatic vessels do?

Answer 6

They permit one way movement of lymph towards the heart

Question 7

What do lymphatic vessels collect?

Answer 7

Excess interstital fluid (as lymph) and returns it to the blood stream via veins

Question 8

What are 2 types of lymphatic veins?

Answer 8

1. Lymphatic capillaries

2. Lymphatic ducts

Question 9

Lymphatic capillaries

Answer 9

Microscopic, blind-ended tubes found in tissue spaces wherever blood capillaries

Question 10

Blind-ended

Answer 10

Open at one end

Question 11

Where are lymphatic capillaries not located? (4)

Answer 11

1. Bone
2. Teeth
3. Bone marrow
4. CNS

Question 12

What are lymphatic capillaries called when they are in the intestinal wall?

Answer 12

Lacteals

Question 13

What do lymphatic capillaries have more of compared to veins?

Answer 13

Valves

Question 14

What do lymphatic capillaries contain?

Answer 14

Lymph nodes

Question 15

What will determine if fluid will move into or out of the lymphatic capillaries?

Answer 15

Fluid pressure in interstitial fluid

Question 16

What happens when fluid pressure is greater in interstidial fluid than lymphatic capillaries?

Answer 16

The doors/valves are pushed open and the fluid moves in

Question 17

What happens when fluid pressure is greater in lymphatic capillaries than interstidial fluid?

Answer 17

The doors/valves are pushed shut and it prevents lymph from leaking backwards

Question 18

How many lymphatic ducts are there?

Answer 18

2

Question 19

What are the 2 lymphatic ducts?

Answer 19

1. Right lymphatic duct

2. Thoracic duct

Question 20

What does the right lymphatic duct do?

Answer 20

Drain lymph from the right upper extremity, right side of the head, neck and upper torso
- right subclavian vein

Question 21

What is the largest lymphatic vessel?

Answer 21

Thoracic duct

Question 22

What does the thoracic duct do?

Answer 22

Drains lymph from the rest of the body

- left subclavian vein

Question 23

What is found along the course of the thoracic duct?

Answer 23

Cisterna chyli

Question 24

Cisterna chyli

Answer 24

Storage area for lymph moving towards entering the venous system

Question 25

What is the function of the lymphatic vessels?

Answer 25

They remove high molecular weight substances and even particulate matter from interstitial spaces

Question 26

What do lacteals do?

Answer 26

They absorb fats and other nutrients from the small intestines

Question 27

What does the circulation of lymph not have?

Answer 27

No pumps

Question 28

What does the circulation of lymph relay on? (2)

Answer 28

1. Breathing

2. Skeletal muscle contractions

Question 29

What do lymph nodes do?

Answer 29

They filter lymph

Question 30

Where are lymph nodes located?

Answer 30

In clusters along the pathway of lymphatic vessels where they converge to form larger trunks

Question 31

What is the function of lymph nodes? (2)

Answer 31

1. Defence mechanism

2. WBC formation