BIOL 2302 Exam 3 Kasparian Questions and Answers Graded A 100% Verified

What are the two functions of the lymphatic vessels? - 1) Return excess fluid from intracellular space to blood circulation 2) anatomical seat of immune system What is the correct order of lymphatic vessels that lymph travel from intracellular space back to circulation? (Smallest to Largest) - Lymphatic capillaries Lymphatic collecting vessels lymphatic trunks lymphatic ducts What type of tissue are lymphatic capillaries made of? - Simple squamous epithelium Describe the lymphatic capillary structure - Overlapped simple squamous cells that form simple values to collect intracellular fluid What type of filament holds down lymphatic capillaries to the surrounding connective tissue - Collagen filaments What force allows interstitial fluid to flow into the lymphatic vessels? - A difference in hydrostatic pressures between interstitial fluid and lymph in the capillary What are lacteals? - capillaries in intestinal mucosa that absorb lipid globules to be metabolized by the liver What is the fluid driving force to transport lymph in the collecting vessels? - skeletal and respiratory pumps Lymphatic trunks drain which major body regions? - Lumbar Bronchomidiastinal Subclavian Jugular Intestinal Where does the Right lymphatic duct drain? - Right side of the upper arm, thorax and head (Thoracic duct gets the rest of the body) Which veins do the two ducts empty lymph back into blood circulation? - Jugular and Subclavian vein What are the two classes of lymphoid cells? - T lymphocytes B lymphocytes What type of tissue is diffuse lymphoid tissue made of? - Reticular connective tissue Where is diffuse lymphoid tissue located? - lamina propria of the mucous membrane What is the structure of lymphoid follicles? - spherical collections of diffuse lymphoid tissue with in a fibrous capsule arranged around a germinal center containing dendritic cells and B lymphocytes What are lymph nodes? - Packets of lymphoid follicles that house lymphocytes and macrophages that filter lymph to initiate the immune response What makes up the cortex of lymph nodes? - follicles housing B lymphocytes What makes up the medulla? - reticular connective tissue that allows sinus of lymph to be filtered housing T lymphocytes Why are there more afferent vessels than efferent vessels? - slow down the flow of lymph to allow enough time for immune cells to initiate their response What are the two functions of the spleen? - 1) lymphocyte proliferation 2) Erythrocyte recycling What are the differences between white pulp and red pulp? - White pulp - made up of lymphocytes in reticular tissue Red pulp - venous sinus with high concentration of red blood cells