Ch28 Lymphatic System

Question 1

What are lymph nodes?

Answer 1

Swellings on the ends of lymph vessels, contain WBCs. Located in armpits, neck, chest, etc.

Question 2

State 3 functions of the lymphatic system.

Answer 2

1. To transport disgested fats from the villi,
2. To store lymphocytes in lymph nodes.
3. To produce antibodies and transport them to site of infection.

Question 3

How does lymph differ from blood?

Answer 3

•It is a yellow colour where blood is red.
•It contains lymphocytes and no RBCs.
•Does not pump through the heart - transported in lymphatic system, separate to the circulatory system.

Question 4

How is lymph returned to blood?

Answer 4

Reenters at left and right subclavian veins, located at the clavicle.

Question 5

How does lymph move?

Answer 5

Through the contracting of body muscles, which squeezes the lmyph along. Vessels have valves to prevent backflow when muscles relax.

Question 6

Why can lymph nodes become swollen?

Answer 6

Due to infection, as more WBCs come to fight infection and produce antibodies.

Question 7

What is the function of the spleen?

Answer 7

Produce antibodies, filters blood and removed old RBCs