i think its the trachea but I'm only a 13 year old girl so what do i know. i guess i will see if I'm right tomorrow. ill get back with the answer
The epiglottis closes over your trachea to keep whatever you're swallowing from going into your lungs.
The epiglottis is the structure that prevents the entry of food into the respiratory system. It is made of connective tissue.
The epiglottis sort of hangs down in the back of the throat and it helps prevent food from entering the trachea when we eat.
it is called the epiglottis.. i think that answers your question :P
Assuming you mean in plant life, it prevents dehydration through evaporation
The marvelous Mucosa. If a toxin can make its way into the Submucosa, it has access to the circulatory system and lymphatic system there.
Epidermal tissue
Prevents food and water entering the lungs
The nasopharyngeal lymphatic tissue is the mucosal lymphoid tissue of the respiratory tract.
The type of epithelial tissue that lines much of the respiratory tract is called pseudostratified columnar. This type of tissue also moves substances across its surface.
The respiratory mucosa is primarily made of pseudostratified columnar epithelium.
In the lining of the respiratory tract.
The blood brain barrier blocks chemicals from entering brain tissue.