Lymphatic system

Question 1

Functions of lymphatic system (4)

Answer 1

Remove excess fluids from body tissues

Micro-organisms/ foreign materials

Products of fat digestion

Lymphocytes

Question 2

5 structures of lymphatic system

Answer 2

Capillaries
Vessels
Ducts
Nodes
Tissues

Question 3

Lymphatic capillaries (3)

Answer 3

= Smallest lymphatic vessels

Networks

Lacteals

Question 4

How is lymph moved through lymphatic vessels

Answer 4

Passive movement of lymph through lymphatic vessels

Contraction of surrounding muscles

Backflow is prevented presence of valves

Question 5

Function of afferent vessels?

Answer 5

Deliver lymph to lymph nodes

Question 6

Function of efferent vessels?

Answer 6

Vessels which leave the lymph nodes

Question 7

Function of lymph nodes?

Answer 7

Filter lymph that travels from tissues to ducts

Question 8

Where are lymphocytes and phagocytic cells found?

Answer 8

Lymph nodes

Question 9

What is removed through lymph nodes as lymph passes through them?

Answer 9

Invading micro-organisms
Dead cells
Debris

Question 10

3 ducts?

Answer 10

Thoracic
Right lymphatic
Tracheal

Question 11

Thoracic duct

Answer 11

Main lymphatic duct

Collects from almost all of the body

Drains into jugular vein or cranial vena cava

Question 12

Right lymphatic duct

Answer 12

Drains from head, neck, thorax and right forelimb

Drains into right jugular or cranial vena cava

Question 13

Tracheal ducts

Answer 13

Drains from head and neck

Drains into thoracic ducts or one of main vessels near heart

Question 14

What does enlargement of individual lymph node suggests?

Answer 14

Infection and perhaps disease in process in that drainage area

Question 15

Names of the 6 lymph nodes

Answer 15

Submandibular - below mandibles

Parotid - below ears

Prescapular - front of shoulders

Axillary - in axillae/ armpits

Popliteal - behind stifle joint

Superficial inguinal - in groin

Question 16

Name the accessory lymphoid tissues (6)

Answer 16

Thymus

Spleen

Peyer’s patches

Tonsils (pharyngeal tonsils)

Vermiform appendix

Red bone marrow

Question 17

What happens to micro-organisms when they invade the body?

Answer 17

Antigens are transported from tissue to the lymph

Question 18

How is the lymph carried?

Answer 18

In lymph vessels to regional lymph nodes

Question 19

Function/structure of tonsils

Answer 19

First line of defence against micro-organisms entering the mouth

Form a ring at junction of pharynx/ oral cavity

Question 20

Which organs are part of the body first line of denfence? 3

Answer 20

Tonsils
Appendix
Peyer’s patches in intestine

Question 21

Function/ structure of thymus

Answer 21

Lymphoid organ located in thoracic cavity in mediastinal space

Produces T lymphocytes and helps other lymphoid tissue to mature

Young animal: thymus in thoracic inlet
Adult: thymus may eventually disappear

Question 22

Structure/ function of spleen

Answer 22

Attached to greater curvature of stomach and lies within omentum

Functions:
1. reservoir for RBC + platelets
2. Removes old RBC & recovers their iron
3. Filters out foreign particles/ bacteria from circulation
4. Produces lymphocytes

Question 23

Function of lymph nodes

Answer 23

Remove particles

Produce lymphocytes