Function of the Lymphatic System
Anatomy and Physiology
What are the two parts of the Lymphatic System?
1)Lymphatic vessels and 2)Lymphoid tissues and organs
What are the functions of the Lymphatic System?
To transport fluids back to blood and act as the bodies defense and resistance to disease.
What is lymph?
excess tissue fluid
How is Lymph made?
it is the interstitial fluid that is forced out at the beginning of the capillary beds and is not put back into the bloodstream.
What parts of lymph are returned in the blood?
Dissolved protein and water
What are harmful materials that enter Lymphatic vessels?
Proteins, cell debris, cancer cells, bacteria, and viruses
What is the role of Lymphatic collecting vessels?
To transport Lymph from Lymph capillaries to nodes where it is filtered until it's return to the circulatory veins
What does the fluid return through to get to the circulatory veins near the heart?
the right Lymphatic duct and the thoracic duct
What is the job of lymph nodes?
They help protect to the body by removing foreign materials such as bacteria and tumor cells
Which leukocytes are present in lymph nodes?
lymphocytes (destroy specific invaders) and Macrophages (destroy non-specific invaders)
What is the role of the spleen?
Filters blood of bacteria and viruses, destroys worn out RBC's, forms blood in fetus, stores some blood
What is the role of the thymus?
functions at peak level during childhood only; produces thymosin to program lymphocytes
What is the role of the tonsils?
trap and remove debris and foreign substances at pharynx
What is the role of the Peyer's Patches?
Capture and destroy bacteria in intestines
What is MALT?
(Mucosa-Associated Lymphatic Tissue) Protects respiratory and digestive tract
What does MALT include?
Peyer's Patches, Tonsils, and other small groups of lymphatic tissue