A component of the body?s second line of defense does not include
cell-mediated apoptosis
an inflammatory response to recent injury
phagocytes ingesting invading organisms
anti-microbial activity due to lysozyme excreted in tears
Viral infected cells sometimes secrete a substance called interferon, which diffuses to other cells and protects them against viral infection. Which is not a possible mechanism by which interferon works?
stimulating host cell DNA to produce an antiviral protein
initiating a chain of events which ultimately blocks viral protein synthesis at the host cell ribosomes
producing a substance which protects the cell against many different kinds of invading viruses
destroying the ribosomes of invading viruses
The disadvantage in heat exchange for adjacent fluids moving in the same direction is that
transfer occurs unevenly if the fluids are not moving the same speed
there is no way to disperse the accumulated heat
eventually it becomes difficult to distingiush the fluids from each other
once the gradient has disappeared, no further transfer can take place