Which statement best describes the difference between responses of effector B cells (plasma cells) and those of cytotoxic T cells? a. B cells confer active immunity; cytotoxic T cells confer passive immunity. b. B cells respond the first time a pathogen is present; cytotoxic T cells respond subsequent times. c. B cells secrete antibodies against a pathogen; cytotoxic T cells kill pathogen-infected host cells. d. B cells carry out the cell-mediated response; cytotoxic T cells carry out the humoral response.

Video transcript

Hi everyone. Let's look at our next problem in a human body immune system, blank secrete antibodies while blank carry out cell mediated responses. So we have to distinguish between cells that secrete antibodies and then cells that are involved in responding. Um when those antibodies bind with an antigen and we have B cells and T cells. So B cells we've got two different types. We've got a Factor B cells and cider toxic B cells affect our B cells secrete antibodies while cider toxic B cells are involved in destroying cells um that are identified um when an antibody binds them by secreting sido toxic Granules into the infected cell. So destroying cells would be part of a cell mediated response. Then we've got T cells and among the answers we've got helper T cells and cider toxic T six helper T cells help out by activating other cells in the immune system. Sido toxic t cells like psycho toxic B. Are involved in destroying infected cells. So that would be cell mediated response. So now that we see that we are going to look at our answers and see which one um corresponds to the order in which our problem gives it to us. So we see um Part one is what are the cells that secrete antibodies? What we saw up here secreting antibodies is the function of the effect or B cells. So that should be in part one of the answer. Part two is carrying out cell mediated responses. So we've got um side a toxic b cells are possibility. So that could be there in part two or side a toxic t cells. So let's evaluate our answer choices. Choice a says side a toxic t cells as part one. So that's not the correct answer. Choice B says helper T cells as secreted antibodies. We know that's not correct. So we can eliminate that choice. Si has sido toxic B cell is the first for secrete antibodies but we know that's not the case. So Choice C. Is eliminated. And we've just got one guy left choice D. Which does indeed correctly have a FACTOR B cells secreting antibodies and site of toxic T cells as being carrying out the cell mediated response. So there we have our answer. Let's move on to the next video.