During inflammation, clotting does not occur at the actual site of injury due to the presence of A)pus. B)pyrogens. C)histamine. D)heparin. E)perforins.
Choose the correct statement about interferons. A)Interferons are part of the complement system. B)Interferons impart resistance to viral infections. C)Interferons secrete cytokines which trigger apoptosis. D)Interferons engage in agglutination and are thus similar to antibodies. E)Interferons interfere with antigen recognition on CD 4 cells.
Which is the action of histamine? A)releases digestive enzymes that destroy the injured cells and then attacks the surrounding tissues B)increases rate of metabolism C)interferes with viral replication inside the cell D)makes capillaries more permeable and speeds up blood flow through the area of damaged tissue E)enhances phagocytosis
Which is true regarding pyrogens? A)They can reset the temperature-regulating center in the hypothalamus and raise the body temperature. B)They break down tissue by autolysis, releasing digestive enzymes that first destroy the injured cells and then attack surrounding tissues. C)They act only within one tissue. D)They are particularly sensitive to chemicals released by other body cells or by pathogens. E)They make capillaries more permeable and speed up blood flow through the area within the damaged tissue.