Ch:24 The Lymphatic System

Question 1

How does lymph from the lymphatic system get transported?

Answer 1

There is no pump like their is in the circulatory system (heart)

• movement triggered by surrounding skeletal muscle

Fluid from tissue spaces is returned to the blood by the lymphatic system. This fluid (lymph) moves in only ONE direction- TOWARD the heart. This fluid movement is due to contraction of the surrounding skeletal muscle.

“THIS IS AN IMPORTANT POINT, SINCE UNLIKE THE CIRCULATORY SYSTEM THEIR IS NO PUMP”

Question 2

How are lymphatic vessels similar to veins?

Answer 2

They also have 3 LAYERS and have VALVES which prevent lymph back flow

Question 3

Lymphatic vessels lead to specialized structures called __2 words__. These structures are filled with WBCs. Some times a person not ill has “swollen glands”. this means it is time to see an M.D. since many cancers can cause the lymph nodes to become swollen. Primary cancers of the lymph tissues are called __________.

Answer 3

Lymph nodes; Lymphoma

Question 4

What type of cancer involves the lymph nodes?

Answer 4

lymphoma

Question 5

What is the main purpose of the lymphatic system?

Answer 5

The lymphatic system brings lost protein and fluids to the blood. It also takes part in immune system surveillance

Question 6

Which WBC’s are present in lymph?

Answer 6

B-Lymphocytes, T-Lymphocytes, plasma cells, macrophages and dendritic cells

Question 7

***Antibodies that are on the move are called ______.

Answer 7

Immunoglobins

Question 8

Which WBC’s make antibodies?

Answer 8

B-Lymphocytes (Humoral immune system)

Question 9

Where do B-Lymphocytes mature?

Where do T-Lymphocytes mature?

Answer 9

B-Lymphocytes = Bone marrow

T-Lymphocytes = Thymus

Question 10

What are the 2 primary immune organs?

Answer 10

Bone marrow and Thymus

Question 11

What are the 2 secondary immune organs?

Answer 11

Lymph nodes and Spleen

Question 12

What is the main purpose of the Thymus?

Answer 12

The thymus is a primary lymph organ where T-cells mature (cell-mediated immunity)

• Found near the heart
• Shrinks after puberty
• Produces growth factors that stimulate proliferation and the differentiation of the T-Lymphocytes

Question 13

What is the main purpose of the spleen?

Answer 13

• Stores a reserve of blood “blood reservoir”
• Largest accumulation of lymph tissue in the body
• Graveyard of old, worn out RBCs
• Produces B and T-Lymphocytes
  “THINK OF THIS ORGAN AS A LARGE LYMPH NODE”
  *** If you ever lose your spleen either by pathology or accident, the liver, lymph nodes, and bone marrow can complete it’s function