BIOL 2302 Exam 3 Kasparian 2024 Questions And Answers

What are the two functions of the lymphatic vessels? - ANS 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) - ANS Lymphatic capillaries Lymphatic collecting vessels lymphatic trunks lymphatic ducts What type of tissue are lymphatic capillaries made of? - ANS Simple squamous epithelium Describe the lymphatic capillary structure - ANS 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 - ANS Collagen filaments What force allows interstitial fluid to flow into the lymphatic vessels? - ANS A difference in hydrostatic pressures between interstitial fluid and lymph in the capillary What are lacteals? - ANS 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? - ANS skeletal and respiratory pumps Lymphatic trunks drain which major body regions? - ANS Lumbar Bronchomidiastinal Subclavian Jugular Intestinal Where does the Right lymphatic duct drain? - ANS 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? - ANS Jugular and Subclavian vein What are the two classes of lymphoid cells? - ANS T lymphocytes B lymphocytes What type of tissue is diffuse lymphoid tissue made of? - ANS Reticular connective tissue Where is diffuse lymphoid tissue located? - ANS lamina propria of the mucous membrane What is the structure of lymphoid follicles? - ANS spherical collections of diffuse lymphoid tissue within a fibrous capsule arranged around a germinal center containing dendritic cells and B lymphocytes What are lymph nodes? - ANS 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? - ANS follicles housing B lymphocytes What makes up the medulla? - ANS reticular connective tissue that allows sinus of lymph to be filtered housing T lymphocytes Why are there more afferent vessels than different vessels? - ANS 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? - ANS 1) lymphocyte proliferation 2) Erythrocyte recycling What are the differences between white pulp and red pulp? - ANS White pulp - made up of lymphocytes in reticular tissue Red pulp - venous sinus with high concentration of red blood cells