Using the three lines of defense explain what could happen if a pathogen enters a human body?

If you have a baby in October what month did you get pregnant? What alternative is there to tracheotomy? Which contractile tissue is found within the walls of blood vessels? Can glycerol be absorbed into the blood directly? Why did entrepreneurs want to link Manchester with Liverpool? Does bone stop regenerating once you reach puberty? What bones are involved in crunches? How do STDs affect your body? What 4 respiratory diseases are caused by smoking? What is the connection between LBD and Alzheimer's disease? What is the back of your neck suppose to look like? How long after late short period should you take a pregnancy test? Why does excrement smell bad? What causes you to become ill after eating shellfish? What is grade 1 degenerative anterolisthesis of L4 on L5. Degenerative disc space narrowing and facet arthrosis L4-L5 and L5-S1 and resultant canal stenosis and neural foraminal narrowing at L4-L5 and? When you get older do your lungs change? When Blood entering the heart is pumped to the lungs before being pumped back out to the body why is this important? What kind of cancer did Erma Bombeck die of? How does the fetus change between the third and sixth months f pregnancy? Difficiency of vitamin c causes what?