Lymphatic System - Unit 3 Flashcards
What is the Lymphatic System
A secondary circulatory system
A one way system
What do lymph vessels do
Lymph vessels collect any fluid surrounding capillaries and returning it back to blood
Describe the structure of the Lymphatic System
It consists of lymph nodes, lymph vessels, tonsils, spleen and thymus gland
State three organs in the Lymphatic system
Tonsils
Spleen
Thymus gland
What are lymph nodes
Swellings in the lymph vessels
Where are lymph nodes located
Theyy are located in clusters in tonsils, neck, spleen and groin
How do these Lymph Nodes fight infection
The nodes filter bacteria
They contain large amounts of lymphocytes
True / False are Lymphocytes WBC’s
True
Lymphocytes are WBC’s
Describe the formation of lymph fluid
Arteries contain blood that is at higher blood pressure than veins
Due to this rapid movement and high pressure often some fluid aswell as some proteins are forced out.
This fluid is called tissue fluid.
Tissue fluid surrounds body cells and helps in the exchange of useful substances
T/F tissue fluid is actually useful
Yes as it aids in the exchange of substances in and out of cells
If tissue fluid is useful then why remove it?
Due to the fact over a litre is produced every hour.
So as to avoid swelling the body is required to remove this tissue fluid
What is the difference between tissue fluid and plasma
Tissue fluid has no platelets, RBC’s or clotting proteins but plasma does
How is Tissue fluid removed
10% of tissue fluid enters the lymph vessels.
This is the lymph fluid
90% of tissue fluid goes back into plasma which is in the capillaries by osmosis.
This process is aided by the low pressure in veins
Name two ways lymph differs from blood
Lymph had high levels of lipids
Lymph doesn’t have RBC’s, Clotting proteins or platelets but blood does
What does lymph fluid contain
High lipids (i.e high fat levels)
Has proteins
Has WBC’s
