Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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- Memory T cells _____. (Select all that apply.) a. must all be activated in secondary lymphoid organs b. do not require co-stimulation through CD28 c. are composed only of CD4 T cells d. do not undergo somatic hypermutation e. are usually short-lived f. do not undergo isotype switching.arrow_forwardType I (immediate) hypersensitivity A. is mediated by IgE B. is mediated by T lymphocytes C. both is mediated by IgE and involves degranulation of mast cells D. involves degranulation of mast cellsarrow_forwardNotice the comment that after treatment your CD4 count should rise. Why does treatment allow CD4s to increase? A Anti-retroviral therapy consists of transfusions of CD4 cells. B Anti-retroviral therapy directly stimulates cell division of CD4 cells, so their numbers increase. C Anti-retroviral therapy will prevent HIV from replicating and killing your CD4s. CD4s can grow back to some degree.arrow_forward
- Identify the mismatched pair. a. MyD88: adaptor protein b. ICAM-1: LFA-1 c. chemokine receptor: G protein d. CD14: LPS e. NK cells: IFN-γ f. selectins: protein ligands.arrow_forwardIf a centrocyte does not interact with antigen and engage CD40 shortly after its derivation, then Select one: a. it recommences somatic hypermutation b. it undergoes apoptosis C. it moves back into the dark zone of the germinal center and switches its isotype d. its surface immunogloblulin levels decrease and proliferation recommences.arrow_forward19. The following event does not occur in the germinal centers of activated B cells? A. somatic hypermutation. B. formation of memory B cells C. RNA recombination D. plasma cell formation 20. Features of T-independent immune response include? A. occurs in people that lack a functional thymus C. give rise to memory cells. 21 Thafall E. class switching B. production of IgG and IgA D. involve immunological synapsearrow_forward
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