1. Chapter 24
Lymphatic system

2. Lymphoid Organs

3. Lymphatic System Organs, vessels and a fluid called lymph
similar to interstitial fluid
Organs involved
red bone marrow
thymus
spleen
lymph nodes
diffuse lymphatic tissue
Fill in figure in notes from text

4. Functions of the Lymphatic System
Draining excess interstitial fluid & plasma proteins from tissue spaces
Transporting dietary lipids & vitamins from GI tract to the blood
Facilitating immune responses
recognize microbes or abnormal cells & responding by killing them directly or secreting antibodies that cause their destruction

5. Lymphatic Vessels & Circulation
Capillaries that begin as closed-ended tubes found in spaces between cells
Combine to form lymphatic vessels
resemble veins with thin walls & valves
Fluid flows through lymph nodes towards large veins above the heart
lymph emptied into bloodstream

7. Lymph Trunks & Ducts Vessels unite to form trunks & thoracic ducts
Right side head, arm & chest empty into right lymphatic duct and rest of body empties into thoracic duct
Lymph is dumped directly into left & right subclavian veins

8. Formation & Flow of Lymph
Fluid & proteins escaping from vascular capillaries is collected by lymphatic capillaries & returned to the blood
Respiratory & muscular pumps promote flow of lymphatic fluid
Lymphatic vessels empty into subclavian veins
Essay: Why are lymphatic vessels vein-like and empty into the superior vena cava?

9. Lymph Nodes
Bean-shaped organs, up to 1 inch long, located along lymphatic vessels
scattered throughout body but concentrated near mammary glands, axillae & groin