holy person produces antibodies to packages that invade the body. But with the infection of H. I V, the body was, is the ability to produce antibodies and how is that possible? Um, and it shows that the matter said Axe and destroys CD for he cells, which help Erkki South. So we have determined the function of this and how we can affect, as we see in this of antibody production. So basically, the helper peace. So is the middleman in turned immune response. So we have an antigen presenting cell that presents an androgen that activates Alberti sell. The activation of that T cell releases side of kinds that activate B cells. Activation of B cells triggers proliferation of plasma cells, which Ruiz antibodies and thus is able to fight the whatever pathogen has entered the body. But if the virus directly kills off helper T cells, then there's no way for the immune system to actually launch a defense against HIV or any other pathogen. Because the cells and T cells, which carry out cell mediated and Hugh Meral immune responses, are not able to be activated and carried out. So let's see which answer best matches that a cease the CD 40 sells a record intermediate are required intermediate in a series of salty cell signal events that must be completed before B cells. Commager. Yes, that is true. As depicted by this diagram. Let's see if there's any other true statements he states the city for T cells have CD four molecules Cove in when we bound to their source cell surfaces and do not induce apoptosis and other cells during an immune response. So, really, we have nothing to the inducing a pop doses really has nothing to do with, uh, the question. It also does not see the forties city for T cells do not induce apoptosis. So that is just a false statement. Um, and it's just not relevant to the question. See, states That CD for T cell counts are about 1000 per micro liter and a healthy person, but drop over 400 per micro liter. So once again, this is not relevant to how C D four T cells and the loss of them, uh, contribute to the loss of any body synthesis. And D says that CD four cell precursors air formed in the bone marrow and then migrate to the thymus where they developed their T cell receptors. So once again, not relevant. So we can see that B, C and D are just irrelevant to the question of antibody synthesis and the connection to CD four C T cells, which, uh, the correct answer to is a
