Question

Which solution is best to use when cleaning a wound that is healing by 101. During an Immunoglobulin E (IgE)-mediated hypersensitivity reaction, the degranulation of mast cells is a result of which receptor action?
Question 5 options:
                 Histamine bound to H2
                 Chemotactic factor binding to the receptor
                 Epinephrine bound to mast cells
                 Acetylcholine bound to mast cells

Question 6

What is the mechanism that results in type II hypersensitivity reactions?
Question 6 options:
                 Antibodies coat mast cells by binding to receptors that signal its degranulation, followed by a discharge of preformed mediators.
                 Antibodies bind to soluble antigens that were released into body fluids, and the immune complexes are then deposited in the tissues.
                 Cytotoxic T (Tc) lymphocytes or lymphokine-producing helper T 1 (Th1) cells directly attack and destroy cellular targets.
                 Antibodies bind to the antigens on the cell surface.

Question 7

Type III hypersensitivity reactions are a result of which of the following?
Question 7 options:
                 Antibodies coating mast cells by binding to receptors that signal its degranulation, followed by the discharge of preformed mediators
                 Antibodies binding to soluble antigens that were released into body fluids and the immune complexes being deposited in the tissues
                 Cytotoxic T (Tc) cells or lymphokine-producing helper T 1 (Th1) cells directly attacking and destroying cellular targets
                 Antibodies binding to the antigen on the cell surface

Question 8

Tissue damage caused by the deposition of circulating immune complexes containing an antibody against the host deoxyribonucleic acid (DNA) is the cause of which disease?
Question 8 options:
                 Hemolytic anemia
                 Pernicious anemia
                 Systemic lupus erythematosus
                 Myasthenia gravis

Question 9

Why does tissue damage occur in acute rejection after organ transplantation?
Question 9 options:
                 Th1 cells release cytokines that activate infiltrating macrophages, and cytotoxic T (Tc) cells directly attack the endothelial cells of the transplanted tissue.
                 Circulating immune complexes are deposited in the endothelial cells of transplanted tissue, where the complement cascade lyses tissue.
                 Receptors on natural killer (NK) cells recognize antigens on the cell surface of the transplanted tissue, which releases lysosomal enzymes that destroy tissue.
                 Antibodies coat the surface of the transplanted tissue to which mast cells bind and liberate preformed chemical mediators that destroy tissue.

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