PSL Exam with 100% correct answers 2024

Describe B lymphocytes, plasma cells, T lymphocytes correct answers B lymphocytes become cells called plasma cells, plasma cells secrete antibodies, the antibodies provide humoral immunity, T lymphocytes provide immunity not by secretion of anitbodies. Identify cytotoxic T cells and helper T cells as types of T lymphocytes correct answers cytotoxic T cell search and destroy the invader by a cell to cell interaction, these cells are directly responsible for cell mediated immunity helper T cells help other immune system cells do their job, they secre chemicals called cytokines that help regulate immune responses Define or describe primary lymphoid organs and secondary lymphoid organs correct answers primary lymphoid organs- supply lymphatic organs with mature lymphocytes= bone marrow (b lymphocytes mature) and thymus (t lymphocytes mature) secondary lymphoid organs- lymph nodes, tonsils, speens, lymphocyte clusters near body linings. they all have lymphatic tissue with lots of lymphocytes- where teh processed or mature lymphocytes go and take up residence. But they house hop or move around which increases a chanbe to meet a lymphocytes specific antigen Do mature lymphocytes stay in one organ? why not? correct answers No, they house hop or move around around to incrase the chance to meet a lympocytes specifc antigen Whats lymphocyte tracking? correct answers No, they house hop or move around around to incrase the chance to meet a lympocytes specifc antigen Where does activation by antigen occur? correct answers secondary lymphoid organs Describe the other type of lymphocytes besides B and T lymphocytes correct answers natural killer cells secrete chemicals to kill the cell Explain generally the roles of different lymphocytes: B cells, plasma cells, cytotoxic T cells and helper T cells correct answers B cells: become plasma cells- occurs after activation by antigen- after antigen binds to receptors. plasma cells secrete antibodies that travel in blood to the invader. cytotoxic T cells: cell-to-cell interaction, goes to the invader helper T cells: are central- help both B and cytotoxic T cells. secrete cytokines- are protein messengers secreted from immune cells. need helper T cells for normal B cell and cytotoxic T cell function.