Bacterias and epithelial surfaces of humans?
I have 2 questions about bacterial invasion of humans.
Why do bacterias necessitate adhesion to epithelial surfaces at all, can't they just grow freely in the intestine/lungs ect?
How do bacterias creep into epithelial surfaces in humans?
Answers:
The intestines/lungs etc. are lined by epithelium, so while bugs do grow freely in these areas they typically do so while adhere to their respective epithelia. There's no big secret reason though, simple gravity is usually enough.
Bacteria, fungi, protozoans can and do live and replicate contained by 'spaces' like the bloodstream. In much the same way as rash American settlers formed towns and villages rather than strike off on their own, survival is much easier though when individual cell can form colonies and work together (production a biofilm to name one example) to evade and counterattack the body's immune system.
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Why do bacterias necessitate adhesion to epithelial surfaces at all, can't they just grow freely in the intestine/lungs ect?
How do bacterias creep into epithelial surfaces in humans?
Answers:
The intestines/lungs etc. are lined by epithelium, so while bugs do grow freely in these areas they typically do so while adhere to their respective epithelia. There's no big secret reason though, simple gravity is usually enough.
Bacteria, fungi, protozoans can and do live and replicate contained by 'spaces' like the bloodstream. In much the same way as rash American settlers formed towns and villages rather than strike off on their own, survival is much easier though when individual cell can form colonies and work together (production a biofilm to name one example) to evade and counterattack the body's immune system.
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