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.
Airway obstruction refers to a condition in which a blockage of the airways causes a reduction of airflow to or absorption of oxygen by the lungs. This blockage may occur in any part of the complex system of passages responsible for delivering air to the lungs. Airway obstructions may be mild or severe, chronic or acute. Airway obstruction differs from airway restriction. When a person experiences airway obstruction, there is a swelling or blockage of some portion of his or her air passages. In contract, a restriction of the airways is caused when a person cannot fully expand his or her lungs to inhale.