Lymphatic/Immune System

Question 1

What is lymph?

Answer 1

Extra fluid that drains from cells and tissues; and isn’t reabsorbed into the capillaries

Question 2

Describe the direction of the lymph flow

Answer 2

Goes from the tissues towards the heart only

Question 3

What are the functions of the lymphatic system?

Answer 3

To return excess tissue fluid to blood vascular system

Question 4

What are the most important 2 types of WBCs that provide specific immunity? Describe their functions

Answer 4

1. T-Lymphocyte : Killer T-cells; kills invading pathogens
2. B-Lymphocyte: Makes antibodies

Question 5

Compare and contrast b/w blood capillary and lymph capillary

Answer 5

Blood capillary: Delivers and collects fluid; cells can’t enter capillary

Lymph capillary: Only collects fluid; very permeable so cells are able to enter capillary

Question 6

What is lacteal?

Answer 6

Specialized lymphatic capillaries in the villi of small intestines

receives digested fats

Question 7

What is a fatty lymph called?

Answer 7

chyle

Question 8

What are the 2 major lymphatic ducts?

Answer 8

1. right lymphatic duct
2. thoracic duct

Question 9

Which one collects abouts 75% of the total body tissue fluid?

Answer 9

Thoracic duct

Question 10

What are the functions of the lymph nodes?

Answer 10

Cleanse the lymph of pathogens

Question 11

Do lymph nodes have more or less afferent vessels than efferent vessels? Explain.

Answer 11

Lymph nodes would have more afferent vessels because we need less efferent vessels to prevent the fluid from leaving the lymph node quickly

Question 12

Gives examples of 4 lymphoid organs

Answer 12

1. tonsils
2. appendix
3. thymus
4. spleen

Question 13

What is the largest lymphatic organ?

Answer 13

Spleen

Question 14

What is elephantiasis?

Answer 14

Transmitted by infected mosquitos, nematode worms block lymphatic ducts

Causes swelling