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Unformatted text preview: saliva, nasal mucus, and tissue fluids. 3. G ASTRIC JUICE---this secretion of the gastric glands of the stomach is highly acidic (pH 1.2-3). Most bacteria and bacterial toxins are destroyed by the acidity. Unfortunately, the toxins of Staphylococcus aureus and Clostridium botulinum survive the stomach acid. Pathogens may also pass through the stomach unharmed when they are protected within food particles. One species, Helicobacter pylori, actually lives and grows in the wall of the stomach, causing most ulcers. Vaginal secretions are also somewhat acidic. 4. T RANSFERRINS---found in blood and inhibit microbial growth by reducing the amount of available iron....
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- Fall '09