What is back diffusion of hydrogen ions?
The back diffusion of hydrogen ion into the normal and abnormal human gastric mucosa was determined by (1) comparing the acid secretion of the stimulated mucosa with and without a glycine buffer solution in the stomach, and (2) measuring hydrogen, sodium, potassium, and chloride fluxes following the instillation of an …
What does gastric acid secretion mean?
Acid is secreted by parietal cells in the proximal two thirds (body) of the stomach. Gastric acid aids digestion by creating the optimal pH for pepsin and gastric lipase and by stimulating pancreatic bicarbonate secretion.
What is back diffusion in solidification?
Back Diffusion Solidification (1998). For a well mixed liquid, a system of simultaneous equations is solved for a given time increment, dt, and enthalpy change, dH. Back diffusion in the primary phase is assumed during secondary solidification while lever rule behavior is assumed for the secondary phase.
What is back diffusion groundwater?
In the context of groundwater contaminants, back diffusion refers to the contamination of a high permeability (k, [L2]) layer or zone (HPZ) by the diffusive transport of contaminants out of an adjacent low k layer or zone (low permeable zone, LPZ).
What are the 3 phases of gastric secretion?
The physiologic stimulation of acid secretion has classically been divided into three interrelated phases: cephalic, gastric, and intestinal [6]. The cephalic phase is activated by the thought, taste, smell, and sight of food, and swallowing. It is mediated mostly by cholinergic/vagal mechanisms.
What are the 3 main hormones that regulate digestion?
The five major hormones are: gastrin ( stomach ), secretin ( small intestine ), cholecytokinin (small intestine), gastric inhibitory peptide (small intestine), and motilin (small intestine).
What are the 6 major digestive secretions?
Secretion. In the course of a day, the digestive system secretes around 7 liters of fluids. These fluids include saliva, mucus, hydrochloric acid, enzymes, and bile.
Are eggs OK for acid reflux?
Egg whites are a good option. Limit egg yolks, though, which are high in fat and may trigger reflux symptoms.
Which is the best description of the process of diffusion?
Diffusion Definition. Diffusion is a physical process that refers to the net movement of molecules from a region of high concentration to one of lower concentration. The material that diffuses could be a solid, liquid or gas.
Which is the best example of contagious diffusion?
Contagious Diffusion – spread of an idea/trait/concept through a group of people or an area equallywithout regard to social class, economic position, or position of power. Examples of Contagious Diffusion Disease – such as colds and flu Religion – spread of Islam
Which is the best example of hierarchical diffusion?
hierarchical diffusion – spread of an idea through an established structure usually from: people of/with power to people of/with less/no power places of power down to places with less/no power (big city → mid city → small city) Examples of Hierarchical Diffusion (people cooler than you)
Why does diffusion occur in a low saturation medium?
Since diffusion is powered primarily by the probability of molecules moving away from a region of higher saturation, it immediately follows that when the medium (or solvent) has a very low concentration of the solute, the probability of a molecule diffusing away from the central area is higher.