Lymphatic System essay questions
Terms in this set (4)
Identify the components of the lymphatic system, and describe the functions of the lymphatic system
Components: lymph, lymphatic vessels, and lymphatic tissue (nodes, spleen, thymus, red bone marrow, MALT)
Functions: returning lost fluid of proteins to blood plasma to maintain BHP and BCOP, transport of dietary fats and lipid doluble vitamins from the GI tract to the blood, and protection via specific and nonspecific immunity
List the four signs of inflammation, and describe how each develops. What benefit is derived from the development of each sign?
-Inflammation is a tussue response to injury.
-Pain is stimulated by kinins and makes person aware of damage.
-Swelling results when histamine increases capillary permeability and water follows escaping proteins
-Redness and heat result as histamine increases vasodilation which increases blood flow to the area
-Increased blood flow bring phagocytes, oxygen and nutrients to the site of damage and removes wastes
-Increased temperature increases the rate of reactions and the activity of phagocytes
Describe the roles of helper T cells
They are most associated with cell-mediated immunity, they also assist in antibody-mediated immunity. The AMI response is more effective when B cells receive constimulation by interleukins secreted by helper and cytotoxic T cell proliferation. Interleukin-2 also activates natural killer cells, thus helping with nonspecific defense
Every cell in the body possesses molecules that could act as antigens in others. How does your own immune system "learn" not to attack your own antigens
Some immature T cells in the thymus undergo positive selection when they become able to recognize self-MHC molecules. Those that cannot recognize MHC molecules die. Those that survive undergo negative selection, in which those cells that recognize fragments of self antigens are eliminated.