BIOL 2302 Exam 3 Questions And Answers 100% Verified.

BIOL 2302 Exam 3 Questions And Answers 100% Verified. What are the two functions of the lymphatic vessels? - answer1) 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) - answerLymphatic capillaries Lymphatic collecting vessels lymphatic trunks lymphatic ducts What type of tissue are lymphatic capillaries made of? - answerSimple squamous epithelium Describe the lymphatic capillary structure - answerOverlapped simple squamous cells that form simple values to collect intracellular fluid What type of filament holds down lymphatic capillaries to the surrounding connective tissue - answerCollagen filaments What force allows interstitial fluid to flow into the lymphatic vessels? - answerA difference in hydrostatic pressures between interstitial fluid and lymph in the capillary What are lacteals? - answercapillaries 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? - answerskeletal and respiratory pumps Lymphatic trunks drain which major body regions? - answerLumbar Bronchomidiastinal Subclavian Jugular Intestinal Where does the Right lymphatic duct drain? - answerRight 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? - answerJugular and Subclavian vein What are the two classes of lymphoid cells? - answerT lymphocytes B lymphocytes What type of tissue is diffuse lymphoid tissue made of? - answerReticular connective tissue Where is diffuse lymphoid tissue located? - answerlamina propria of the mucous membrane What is the structure of lymphoid follicles? - answerspherical 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? - answerPackets of lymphoid follicles that house lymphocytes and macrophages that filter lymph to initiate the immune response What makes up the cortex of lymph nodes? - answerfollicles housing B lymphocytes What makes up the medulla? - answerreticular connective tissue that allows sinus of lymph to be filtered housing T lymphocytes Why are there more afferent vessels than efferent vessels? - answerslow down the flow of lymph to allow enough time for immune cells to initiate their response What are the two functions of the spleen? - answer1) lymphocyte proliferation 2) Erythrocyte recycling What are the differences between white pulp and red pulp? - answerWhite pulp - made up of lymphocytes in reticular tissue Red pulp - venous sinus with high concentration of red blood cells What is the structure that forms inward capsules that extend inward into the medulla of the spleen that stores platelets and broken down erythrocytes? - answerTrabeculae What structure is responsible for secretion of hormones that causes T-cells to be immunocompetent? - answerThymus When is the thymus most active? - answerinfancy to childhood When does the thymus begin to atrophy? - answerAdolescence