1. The Lymphatic System Create a new folder in eBackpack
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2. Lymphatic system Anatomy Physiology Lymphatic vessels
Thin walled tubes
Throughout the body, but numerous in the dermis
Progress is size from small capillaries to large vessels such as the thoracic duct
Have numerous valves
Allows for diffusion
Drains excess fluids from all over the body
Allow them to transport various size particles (microorganisms to proteins)
Allows lymph to move in a single direction

3. Fun fact:
Florence Rena Sabin (born in 1871), studied pig embryos to determine how the lymphatic system develops. Sabin discovered that lymphatic vessels arose from veins. She found that the outer layer of cells on veins sprouted buds, much like stems growing out of the branches of trees. As these stems grew outward, they connected with each other forming the lymphatic vessels.

4. Why do lymph vessels have valves?
Lymph vessel valves
Why do lymph vessels have valves?

5. Lymphatic capillaries converge to form lymph vessels that ultimately return lymph fluid back to the circulatory system via the subclavian vein.
The presence of one-way valves in the lymph vessels ensures unidirectional flow of lymph fluid toward the subclavian vein.

6. Anatomy
Physiology
Lymph Nodes
masses of tissue enclosed in a capsule
located throughout the body, prevalent in the neck, groin, bends of elbows and knees, armpits and in the mediastinum
contain T-lymphocytes and B-lymphocytes
Filter lymph before it reenters the bloodstream
Guard the body
Foundation of the immune system

8. Link

10. Anatomy
Physiology
Lymph
the excess tissue fluid pumped through the lymphatic vessels
consists of organic materials such as proteins and fats, some lymphocytes, maybe some red blood cells, and any microorganisms present
Maintains homeostasis by balancing fluid distribution in the body
Gets filtered in nodes and functional materials are recycled into the bloodstream.
What do you think would be recycled?

11. Edema
If excess fluid cannot be returned to the blood stream then interstitial fluid builds up, leading to swelling of the tissues with fluid, this is called edema.
Link

12. Anatomy
Physiology
Thymus
a gland that is larger in children than in adults
produces thymosin, a hormone  that stimulates the differentiation and maturation of T cells

13. Anatomy
Physiology
Spleen
a large lymph node that serves as a home for cells of the immune system
 filters blood
stores excess blood

14. Summary Video Link What 3 structures make up the lymphatic system?
Vessels, nodes, and lymph
The lymphatic system does not have a pump. How is lymph moved?
Muscle action
What structure keeps lymph flowing in one direction?
Valves
Why are proteins often transported in the lymphatic system?
Proteins can more easily diffuse into lymph capillaries which carry the proteins to the veins
What infection fighting cells are found in the lymph nodes?
Lymphocytes