Answer:
the olfactory epithelium
Explanation:
There are several protective features of the respiratory system which is responsible for stopping the less aggressive pathogens. Some of these protective features are:
Hairs in nose which trap pathogens like bacteria, virus from entering the lungs. The respiratory tract has mucus which is responsible for trapping the microbes and mucus have IgA antibodies which helps in eliminating these microbes. Alveolar macrophages engulf the pathogen and digest them
Olfactory is not a protective feature of the respiratory system and is responsible and adapted to detect the odor and transfer this signal to the brain.
Some factors could be:
weather
ressources
Cellular respiration is the process in which water and carbon dioxide are waste products.
I don't know what options do you have but the mold<span> that </span>appears<span> sometimes in our food, making it possible to be ingested can be toxic. The </span>mold<span>, called Penicillium crustosum produces powerful </span>neurotoxins, such as <span>penitrem A, that can penetrate the </span>hematoencephalic<span> barrier leading to toxic effects on the brain.</span>
