Goal of 1st line of defense: to prevent pathogen from entering body
There are physical and chemical barriers where all exposed body entrances would be. Ex. Skin, mouth, eyes, nostrils.
-The skin: composed of tough dead cells that are constantly shedding- physical barrier bc it prevents pathogen from latching on. Skin also contains sweat and oil glands that secrete acids and oils that prevent the growth of pathogens- chemical barrier. Also, sweat contains lysozyme.
Saliva and tears: protect the mouth and the eyes from pathogen invasion. Saliva and tears contain lysozyme.
Nostrils, digestive + respiratory tracts lined with another barrier: mucous.
Your adrenal glands would probably secrete adrenaline
You can get an X-Ray, see a chiropractor, etc.
I’m not to sure but I think the answer is all of the above
Yes, there are many of these kind of procedures, and here are some examples, like deep palpation and percussion, examination of the ear-drum or inside the nose
