1. Lymphatic System List the functions of the lymphatic system
Explain the difference between lymph, blood plasma and interstitial fluid. (intercellular fluid)
Explain what filters the lymph in the body
Describe how the Lymphocytes create immunity to a pathogen

2. Lymphatic System: Overview
Consists of two semi-independent parts
A meandering network of lymphatic vessels (moves Lymph)
Lymphoid tissues and organs scattered throughout the body (Filters Lymph)
Returns interstitial fluid and leaked plasma proteins back to the blood
Lymph – interstitial fluid once it has entered lymphatic vessels

4. Different names for the SAME FLUID***
Blood plasma is the watery part of human blood.
Interstitial fluid (intercellular fluid) is the fluid found surrounding all the cells of the body
Lymph fluid is found in lymph vessels
**** These 3 different fluids are the same fluid just with different names depending on where the fluid is located. (blood plasma = Lymph = Interstitial fluid)

5. The lymphatic system
It transports a watery clear fluid called lymph = interstitial fluid . 
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, protect against antigens (viruses, bacteria, etc.)

6. Main functions****** The lymphatic system is composed: lymph vessels
lymph nodes
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)

7. Lymph organs include the bone marrow, lymph nodes, spleen, and thymus.
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.

8. Lymphocytes***** T cells B cells Both create memory cells for immunity
Manage the immune response
Helper and Suppressor T cells
Attack and destroy foreign cells
B cells
Produce plasma cells, which secrete antibodies
Antibodies immobilize antigens
Both create memory cells for immunity

9. A one-way system in which lymph flows toward the heart
Lymphatic Vessels
A one-way system in which lymph flows toward the heart
Lymph vessels include:
Microscopic, permeable, blind-ended capillaries
Lymphatic collecting vessels

10. Lymphatic System

11. Lymph Capillaries

12. Lymph movement
Lymph vessels are closely associated with the circulatory system vessels.
Contraction of skeletal muscle causes movement of the lymph fluid through valves.

13. Lymphatic Vessels

14. Lymph Transport
The lymphatic system lacks an organ that acts as a pump
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

16. Their two basic functions are:
Lymph Nodes
Their two basic functions are:
Filtration – macrophages destroy microorganisms and debris
Immune system activation – monitor for antigens and mount an attack against them

17. Structure of a Lymph Node
Figure 20.4a, b

18. Spleen
Largest lymphoid organ, located on the left side of the abdominal cavity beneath the diaphragm
Functions
stores disease-fighting components of the immune system (lymphocytes)
Immune surveillance and response
Cleanses the blood – takes out old and defective red blood cells

19. Filtering
Lymph nodes are filters of the lymph 
The spleen is a filter for old red blood cells  

21. Disorder of the Lymphatic System
Lymphoma 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).