1. At which age does the thymus reach its maximal sizes? a. At birth During the
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1. At which age does the thymus reach its maximal sizes? a. At birth During the first year of life c Teenage years (puberty) Between 40 and 50 years of age e. After 70 years of age 2. Which of the following leukocytes would you expect to be in highest numbers in blood two-weeks after a viral infection? a. CD8 T cells (cytotoxic T cells) b. neutrophils C. Plasma cells d. dendritic cells e, all of the above 3. Which of the following statements are TRUE about Toll-ike receptors (TLRs)? a. They may be found as membrane receptors on pathogens. b. They may be found as membrane receptors in the endosomal membrane of cells c. They may be found as soluble receptors in the cytosol of cells. d. They can react to every possible structural detail of microorganisms. e. a andb 4. Which of the following is an example of intrinsic immunity? a. natural killer cells b. anti-microbial peptides in skin c. antibodies d. plasma cells e. CD8 T cells 5. Which of the following statements are TRUE about immune cells? a. Antigen-loaded dendritic cells (DCs) enter the lymph node (LN) via the blood vessels while naive T cells enter via the afferent lymphatics. b. Both antigen-loaded DCs and naïve T cells enter LN via blood vessels c Antigen-loaded DCs enter LN via afferent lymphatics while naïve T cells enter via blood vessels d. Both antigen-loaded DCs and naive T cells enter LN via the afferent lymphatics. e. The trafficking of antigen-loaded DCs and naïve T cells within LN is random. 6. The main function of mast cells is to: a. phagocytize bacteria. b. activate macrophages. c. kill virally-infected cells. d. stimulate T cell responses. e. recruit blood-borne effector cells and increase blood vessel permeabilityExplanation / Answer
Thymus reach its maximum size during the early years of life and decrease thereafter.
Cytotoxic T cells will be the highest in number after viral infection as they are the main arsenal against viral cells.
Toll like receptors are the receptors present on the endosomal membrane of the cell like macrophages and dendritic cells which help identify the antigen.
Antimicrobial peptides found on skin are the intrinsic immunity which are cellular-based anti-viral defense mechanisms.
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