Mucosal antibacterial properties, a valvelike mechanism, host immune responses, and defensins are all host defense mechanisms found in the ______ tract
a. digestive
b. upper respiratory
c. urinary
d. genital
C
Host defense mechanisms are often able to eliminate organisms before they cause infection. One such defense is a valvelike mechanism at the junction of the ureter and bladder that prevents the backward flow of urine from the bladder to the upper urinary tract.
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The USDA requires that food products from genetically modified organisms be clearly labeled as such. Indicate whether the statement is true or false
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