Fats, such as the fats in milk, need to be digested by your body. They are broken down into fatty acids and glycerol by an enzyme called lipase. Gastric lipase, secreted by the stomach lining, has a pH value for optimal activity around neutrality and would appear, therefore, to be essentially inactive in the strongly acid environment of the stomach.
The structures of your upper respiratory system are always working overtimeâfiltering air, expelling pollutants, and relying on other anatomy to remain healthy and intact. Let's take a look at some of the structures and jobs of the upper respiratory system. Nasal Cavity The nasal cavity is a chamber of the internal nose that connects to the nasopharynx. Air is inhaled through the nostrils and warmed as it passes through the nasal cavities.
The mouth and upper throat are sometimes referred to as the oropharynx or oral cavity. The important structures of the mouth and upper throat include the following: Lips; Inside lining of the cheeks (mucosa) Teeth; Gums (gingiva) Tongue; Floor of the mouth; Back of the throat, including the tonsils (oropharynx) Roof of the mouth (the bony front part [hard palate] and the softer rear part [soft palate]) Area behind the wisdom teeth; Salivary glands