PMHS - Weebly
Lymphatic System
Lymphatic System: Overview
← Consists of two semi-independent parts
• A meandering __________________________________________ (moves Lymph)
• Lymphoid tissues and organs scattered throughout the body (_______ ________________)
← Returns interstitial fluid and leaked plasma proteins ________________________
← Lymph – _______________________________________________________
[pic]
Different names for the SAME FLUID
← Blood plasma ___________________________________________________
← Interstitial fluid __________________________________________________
← Lymph fluid ________________________________________
**** These 3 different fluids are the same fluid just with different names depending on where the fluid is located. (blood plasma = Lymph = Interstitial fluid)
←
The Lymphatic system
← It transports a watery clear fluid called lymph = __________________________
← This fluid distributes immune cells and other factors throughout the body. It also interacts with the blood circulatory system to drain fluid from cells and tissues.
← The lymphatic system contains immune cells called lymphocytes, ___________ _________________________________________________________________
Main functions
← The lymphatic system is composed:
• ___________________________
• ____________________________
• organs
← The functions:
• to collect and return interstitial fluid & plasma protein to blood, thus helps maintain fluid balance________________
• to defend the body against disease by producing lymphocytes (B-cells, and T-cells)
←
Lymph organs
← Lymph organs include the bone __________, lymph nodes, spleen, and _____.
← Precursor cells in the bone marrow produce lymphocytes.
• B-lymphocytes (B-cells) mature in the bone marrow.
• T-lymphocytes (T-cells) mature in the thymus gland.
Lymphocytes
← T cells
• Manage the immune response
← _____________________________________ T cells
• Attack and destroy foreign cells
← B cells
• Produce _________ cells, which secrete antibodies
• Antibodies immobilize antigens
Lymphatic Vessels
← ____________________ system in which lymph flows toward the heart
← Lymph vessels include:
• Microscopic, permeable, blind-ended capillaries
• Lymphatic collecting vessels
[pic]
Lymph Capillaries
[pic]
Lymph movement
← Lymph vessels are _____________________________with the circulatory system vessels.
← Contraction of skeletal muscle causes movement of the lymph fluid through valves.
Lymph Transport
← The lymphatic system lacks an organ that acts as a _________
← Vessels are low-pressure conduits
← Uses the same methods as veins to propel lymph
• Pulsations of nearby arteries
• Contractions of smooth muscle in the walls of the lymphatics
Lymph Nodes
← Their two basic functions are:
• ______________________ – macrophages destroy microorganisms and debris
• Immune system activation – monitor for antigens and mount an attack against them
←
Structure of a Lymph Node
[pic]
Spleen
← __________________________________, located on the left side of the abdominal cavity beneath the diaphragm
← It extends to curl around the anterior aspect of the stomach
← It is served by the splenic artery and vein, which enter and exit at the hilus
← Functions
• Site of lymphocyte proliferation
• Immune surveillance and response
• _____________ the blood – takes out old and defective red blood cells
Filtering
← ___________ are filters of the lymph
← The ____________ is a filter for old red blood cells
Disorder of the Lymphatic System
← ___________ is a group of cancers that affect the cells that play a role in the immune system, and primarily represents cells involved in the lymphatic system of the body.
← They often originate in lymph nodes, presenting as an enlargement of the node (a tumor).
................
................
In order to avoid copyright disputes, this page is only a partial summary.
To fulfill the demand for quickly locating and searching documents.
It is intelligent file search solution for home and business.