The upper respiratory tract includes the larynx, the pharynx and the nose.
When sugar solutions of different concentrations are on opposite sides of a semipermeable membrane, the molecules on both sides of the membrane flow across the membrane. However, there is a net flow of molecules from the more concentrated solution into the less concentrated solution, until the concentrations are equal. Once equilibrium is reached, roughly equal numbers of molecules move in each direction across the membrane.
The antrum of the stomach is also known as Pylorus. The
narrow inferior region of the stomach that connects with duodenum of the small
intestine is Antrum. The chief cells,
within the mucosa of the stomach secretes the principal gastric enzyme
pepsinogen is Zymogenic. The main chemical activity of the stomach is to begin
the digestion of proteins with the enzyme pepsin.