Unit 4- Lymphatic System

Question 1

List the 3 functions of the lymphatic system

Answer 1

1. Defense response
2. Drain excess fluid
3. Provide alternative highway for fluid to travel instead of arteries and veins

Question 2

How are Lymphatic vessels like veins in structure and direction?

Answer 2

contains capillaries and vessels and vessels get larger as they get closer to the heart

Flow in an afferent direction and have valves to prevent backflow

Question 3

Name the fluid that travels through lymphatic vessels

Answer 3

interstitial fluid

Question 4

What is the order of the flow of lymph, interstitial fluid, and plasma

Answer 4

Plasma —> interstitial fluid —> lymph

Question 5

What classifies an organ as part of the lymphatic system?

Answer 5

1. ability to house or produce Lymphocytes (white blood cells)
2. Contain Lymphatic vessels for an alternate fluid route with filtration

Question 6

Identify the lymphatic organs and their locations

Answer 6

1. Tonsils (throat)
2. Thymus (posterior to sternum)
3. Spleen
4. Peyer’s Patches (small intestine)
5. Bone Marrow (bone)
6. Thoracic Duct
7. Right Lymphatic Duct

Question 7

Which is the only lymphatic organ capable of producing lymphocytes or white blood cells (WBC)?

Answer 7

Bone Marrow

Question 8

Which lymphatic structure allows the maturation of lymphocytes?

Answer 8

Thymus

Question 9

Identify the 2 lymphatic ducts that allow for drainage of lymph. What percentage of lymph does each duct drain into the cardiovascular system?

Answer 9

1. Right Lymphatic Duct- 25%
2. Thoracic Duct- 75%

Question 10

What occurs if lymphatic fluid is not picked up by lymphatic capillaries in the tissues?

Answer 10

lymphedema (swelling of lymph)

Question 11

Describe the function and location of the spleen. From what artery does the splenic artery branch?

Answer 11

Function:
* Principal Lymphatic organ
* Filters and stores blood
* Removes “old” Red Blood Cells

Branches from celiac trunk

Question 12

Describe the function of a lymph node

Answer 12

filter

Question 13

Name the vessels that carries lymph into and out of the lymph node

Answer 13

Into- Afferent Lymphatic Vessel
Out of- Efferent Lymphatic Vessel