heyooo; i guess they kinda overlap.. this is the info i have on that stuff
chemical barriers :
Stomach's acidic environment/ helps to destroy micro organisms which are accidentally ingested.
Body secretions can include :
Tears- flush foreign matter from the eye/ which prevents micro organisms settling in the eye
Saliva--washes micro organisms from the mouth into the stomach where they can be destroyed by digestive enzymes
Urine-sterile acidic fluid/ helps wash out any micro organisms which are present in the Urethra.
Micro-flora-provides non-specific defence against foreign matter. For example bacteria in certain parts of the body; likkkkkkkkkkkke VAGINA- keep fungal growths in balance.( if imbalanced--> can result in thrush)