The blood is refreshed in the lungs. It is thinned walled and lined with different types of delicate muscles. It lets the ear get air. There are a pair of these in each of us- one for each ear. Different than regular skin, always moist, thinner.
Mucosa is the delicate moist pink lining of the nose and respiratory passages.
Healthy mucosa has a bit of a shine. It extends from behind the nose to the back of the mouth - above and behind the uvula. Hearing loss stands alone. Toxic means poisonous. Ototoxic drugs can cause permanent deafness.