The epiglottis.
the epiglottis
This stops air from entering the chest cavity, and prevents collapsing the lung.
Air is an insulator of heat and prevents outside heat from entering the house.
A small leaf-like structure that closes the passageway to the larynx to prevent food from entering the larynx and trachea when you swallow. When it is open it allows for the passage of air and sound.
You should ALWAYS use an air cleaner on any vehicle. The filter prevents contaminates from entering the fuel and combustion system.
Hopefully, they burn up on entering our atmosphere, due to friction with the air.
epiglottis
It kills and prevents the recontamination of harmful pathogens.
pharynx
whats prevents food from going down your lungs
The epiglottis, a small flap in the throat, works by using nerves to sense when food is being swallowed. As food is on its way down, the epiglottis seals the opening of the trachea so that you don't accidentally swallow food into your lungs.
oropharynx