BIOL 1051H Lecture Notes - Lecture 5: Antigen, Il2Ra, T Helper Cell
Document Summary
Lecture 5: lymphatic and the immune system (chapter 21) Not an organ system but a cell population hat inhabits all organs and defends the body from agents of disease. Lymphatic system- works with immune system to remove disease- causing agents. The true organ system: network of organs and vein-like vessels that recover fluid and: inspect it for disease agents, activate immune responses return fluids to the bloodstream. Network of connecting vessels: collects fluid (lymph) between cells (interstitial fluid) and returns it to bloodstream, picks up lipids form digestive organs and transports them to blood stream, functions to defend the body against pathogens. Maintains fluid balance, protects the body form infection and disease. Lymph flows under forces similar to those that govern venous return, except no pump (heart) Lymph flows at low pressure and slower speed than venous blood. Moved along by rhythmic contractions of lymphatic vessels.
