The Lymphatic System

Question 1

Lymphatic vessels

Answer 1

Transport fluid that has escaped the blood system, back into the blood.

Question 2

Lymphoid organs

Answer 2

House phagocytes and lymphocytes.

Question 3

What direction does lymph flow?

Answer 3

Toward the heart.

Question 4

What are the 2 “semi-independent” parts of the Lymphatic System?

Answer 4

1. Lymphatic vessels

2. Lymphoid tissues and organs

Question 5

What are lymphatic vessels lined with?

Answer 5

Endothelial cell, smooth muscle and adventitia (CT).

Question 6

Lymph capillaries

Answer 6

Absorb leaked fluid.

Question 7

What is the purpose of the “mini valves” in the lymph vessels?

Answer 7

To open when fluid pressure is higher in the interstitial space, and shut when pressure in the vessel is high, to prevent lymph from leaking back out.

Question 8

What makes up 40% of the equine lymph vessel walls?

Answer 8

Elastin.

Question 9

Where are lymph node clusters found?

Answer 9

In the axillary, inguinal, and cervical regions.

Question 10

Lymph nodes

Answer 10

Filter lymph, macrophages and lymphocytes fight foreign substances before the lymph exits the nodes.

Question 11

Where does lymph enter and exit the node?

Answer 11

Lymph enters rough afferent vessels and exits through efferent vessels.
*there are more afferent than efferent.

Question 12

What are the 5 lymphoid organs?

Answer 12

1. Bone marrow
2. Thymus
3. Tonsils
4. Peyers patches
5. Spleen

Question 13

Spleen

Answer 13

Filters blood.
Returns worn out RBC’s to the liver.
Blood reservoir.
Stores platelets.

Question 14

Peyers patches

Answer 14

In the small intestine
MALT - Mucosal Associated Lymphoid Tissue
*GALT - Gut Associated Lymphoid Tissue

Question 15

Bone marrow

Answer 15

Made up of CT fibres, fat cells, blood vessels, and blood producing cells. T and B lymphocytes are made in bone marrow.