| 1 | Acid irritates the stomach lining. | |
| 2 | Tiny AIDS virus more easily through a slight injury in human skin and mucous membrane infected people. | |
| 3 | Larger, more complex proteins in solid foods may damage the membrane, allowing the virus to pass through the gut wall. | |
| 4 | Literally. Tears not only lubricate our eyeballs and eyelids, they also prevent dehydration of our various mucous membranes. | |
| 5 | This is because the anal mucosa is highly susceptible to trauma and so the risk of HIV infection through receptive anal sex is very high. |