ANP 1105 Lecture Notes - Lecture 10: Limbic System, Subclavian Vein, Reticular Connective Tissue

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: William Staines

Document Summary

Lymphatic system returns fluids leaked from blood vessels back to blood; consists of three parts. Lymphoid organs and tissues provide structural basis of immune system by housing phagocytic cells and lymphocytes. Structures include spleen, thymus, tonsils, lymph nodes, other lymphoid tissues. & leaked plasma proteins back to blood via: Lymphatic vessels (lymphatics): elaborate network of drainage vessels that circulates ~ 3l interstitial fluid per day. Once interstitial fluid enters lymphatics, it is called lymph. Lymphatic vessels offer a one-way system, ensuring lymph flows only toward heart. Blind-ended vessels that weave between tissue cells and blood capillaries. Absent from bones, teeth, & bone marrow. Similar to blood capillaries, but more permeable. Can take up larger molecules and particles that blood capillaries cannot. Example: proteins, cell debris, pathogens, and cancer cells. Can act as route for pathogens or cancer cells to travel throughout body. Increased permeability due to two specialized structures. Endothelial cells overlap loosely to form one-way minivalves.