Shutting it.
your boogers
they are specalised by having a wall of agar jelly around the cells to prevent bacteria.
The "blood/brain barrier" prevents most particals like bacteria from entering the brain.
The pores on your skin help to prevent harmful pathogens from entering. Pathogens cause disease, infection and Cancer. By keeping these pathogens out, this is how pores protect you.
Bacteria is always present in the mouth.
The stuff is sticky and there are tiny hairs that move sheets of it towards the back of your throat and you swallow it. Mucous has a job of trapping bacteria, pollen or even insects and it tries to prevent them from entering the body.
The acid in your stomach is a Bacteria, digesting your food and keeping you alive. But other Bacteria come from outside your body, entering from the nose or mouth, making you sick. But only Bacteria can be cured, not viruses. So there are Good Bacteria that keep you alive, and others that try to kill you.
The mouth prevents pathogens from entering the body through several mechanisms. Saliva contains antimicrobial proteins, such as lysozyme and immunoglobulins, which help neutralize harmful microbes. Additionally, the presence of beneficial oral bacteria can outcompete pathogens, while the physical barrier of the mucosal lining helps block their entry. Chewing and swallowing also aid in mechanically breaking down food and flushing away potential pathogens.
In a single year, a single human will produce about 547.5 liters of saliva. The average persion creates about .75 to 1.5 liters of saliva everyday. Saliva keeps the mouth moist and helps prevent certain bacteria from entering the body.
After entering your nose and mouth, air travels down your windpipe (trachea) and into your lungs.
No, cellulitis is not caused by a virus. It is a bacterial skin infection usually caused by Staphylococcus or Streptococcus bacteria entering the skin through a cut or wound. Prompt treatment with antibiotics is important to prevent complications.
Antiseptics kill bacteria in bacterial infections. They also prevent any other germs from entering the site of the infection such as in a cut.