Lymphatic System

What are the 2 main functions of the Lymphatic System?

1. Fluid Retrieval Function

2. Carries Immune Responses

What are 2 examples of fluid retrieval of the lymphatic system?

• drain interstitial (“in tissue”) fluid

• transport dietary fluids

What are the 3 parts to the Lymphatic System?

1. Lymph

2. Lymphatic Vessels

3. Lymphatic Tissues & organs

2 primary lymphatic organs vs

2 secondary lymphatic organs

Primary: red bone marrow & thymus

Secondary: spleen & lymph nodes

What are the 2 things Lymph is made up of?

• Interstitial fluid- leaked out of capillaries

• Fats- absorbed from digestive sys

Lymph flows in one direction through?

Lymphatic Vessels

Lymph flow (4)

1. Lymphatic capillaries

2. Lymphatic collecting vessels

3. Lymphatic Trunks

4. Lymphatic Ducts:

   • Right Lymphatic Duct &

   • Thoracic Ducts

2 functions of Lymphatic Capillaries

• collect interstitial fluid

• have lacteals that absorb fats from dig sys

2 parts of Lymphatic Collecting Vessels & function

• Valves- prevent black flow

• Lymph nodes- house immune cells

Parts Ducts receive fluid

• Right Lymphatic Duct

• Thoracic Duct

• Right: right neck, head, arm, & upper chest

• Thoracic: left neck, head, arm, chest, & both legs

Lymph exits ducts & enters where?

• Right Lymphatic Duct

• Thoracic Duct

• Right: right internal jugular vein+right subclavian vein

• Left: left internal jugular vein+left subclavian vein

What is the term for the “pump” function of the Lymphatic System?

Fluid retrieval function

What are the 2 pumps of the Lymphatic Sys

• Muscular Pump: skeletal muscles contract

• Respiratory Pump: breathing muscles contract

What are the 3 immune cells?

1. Lymphocytes: B cells & T cells 

2. Macrophages: phagocytes 

3. Dendritic Cells: phagocytes 

What is the 1 Lymphatic cell not part of the immune system & its function?

Reticular Cell: makes Reticular CT that houses immune cells 🏠

What does MALT stand for & what does it do?

Mucosa Assosiated Lymphatic Tissue

• mucous membrane lining open body cavities

What are the 4 malt locations?

1. Appendix

2. Peyer’s patch

3. Pharynx Tonsils

4. Respiratory, urinary, reproductive tracts

What is the Peyer’s patch?

the ileum of the small intestine

What are the 3 Pharynx Tonsils and #amount

• 2 palatine

• 2 lingual

• 1 Pharyngeal (adenoids)

What is immunocompetence

Lymphocyte ability to recognize foreign antigens

Where are the 2 training sites for Lymphocytes

1. B cells- Red bone Marrow

2. T cells- Thymus

What are most lymphatic tissue & organs made by?

Reticular CT

The thymus is the only lymphatic organ made by?

Epithelial Tissue

The thymus

• allows what cells

• does not allow what cells

• allows: T cells, macrophages & dendrites

• does not allow: B cells & reticular cells

What is the most abundant lymphatic organ?

Lymph nodes (where most likely for immune response to occur)

2 functions of Lymph Nodes

filter lymph & house immune cells

What is the largest Lymphatic organ?

Spleen

6 functions of the Spleen

1. filter blood

2. RBC graveyard

3. RBC production in fetus

4. store immune cells

5. store platelets

6. stores iron