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.
Definition. 1  Pediatric Airway Anatomy. 2  Obligate Nasal Breathers. 3  Large Tongue. 4  Large Occiput. 5  Larynx and Trachea are funnel shaped. 6  Vocal Cords slant anteriorly. 7  Larynx located higher in neck (at C4 vs. C6 in adults) 8  Narrowest part of the pediatric airway is at cricoid cartilage (until age 5). In adults the narrowest part is at the glottis opening.