The stomach serves first as a receptacle for swallowed food. Second, it begins the chemical digestion of the food by bathing the food in acid, turning it into kind of mush.
The small intestine is where the nutrients are absorbed from the food. Anything that is not absorbed into the bloodstream is considered waste and fiber. This is passed on to the large intestine where is is eventually eliminated.
Next, the food is swallowed and arrives in your stomach, where mechanical digestion continues. Also, chemical digestion begins for foods that contain protein, such as meat, fish, and beans. Cells in the lining of your stomach release enzymes and hydrochloric acid. In contrast to the near-neutral pH of your mouth, the pH here drops to a very acidic level of about 2.
Because it is the ideal pH for enzymes in intestine to work
Pepsin has a optimum pH of 2, as found within the stomach. In the duodenum, the first part of the small intestine, the pH rises to 7.6. This relatively high pH damages the tertiary structure of the pepsin enzyme causing it to denature.
pepsin is found in the stomach and the pH there is 2 while trypsin is found in the small intestine (duodenum and jejunum) and the pH there is 8-9. Thus, the optimum pH levels for pepsin and trypsin are 2 and 8-9 respectively.
The enzymes in the pancreas (which include several proteases, several nucleases, several elastases, pancreatic amylase, carboxypeptidase and steapsin) need to be of an alkaline pH (about pH8) to cancel out the highly acidic produce of the stomach. The pancreatic juices meet the bolus in the duodenum of the small intestine.
In the mouth, you have a pH of 7, in which amylase(the enzyme in saliva) works well with a pH near to 7. As you swallow the food, it gets passed into your stomach, which has a pH of 2. The low pH in the stomach helps digestion take place. Pepsin, the main enzyme in the stomach, works well with a pH of an acidic solution. Then the food gets passed into the small intestine. Here the pH is a slightly basic 8. The digestive fluids that surround the food, such as bicarbonate ion, work well in a slightly basic solution. The food has been split up into small enough molecules now and is ready to be passed absorbed into your bloodstream.
Your stomach empties its contents into the small intestine. Here, digestive fluid containing bicarbonate ions surrounds the food.
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its usually about 2-3 I believe the pH to be around pH 6-6.5 for the duodenum. The pH of the stomach is 1-3 so 2-3 is still in the stomach. The small intestine is anywhere between 6-8 as the pancreas dumps bicarbonate in.
fluids in the stomach are primarily acidic due to their low pH as caused by the presence of hydrochloric acid. fluids in the small intestines are basic that is they have high pH because of the high bicarbonate content from the bile secreted into the duodenum.
The saliva need to be gentle enough at 7 pH to make foods small enough to swallow safely. The stomach needs to have strong acidity, at a 1 or 2 pH, to break down proteins into amino acids. The small intestine is where almost all of the absorption of the smaller portions are absorbed into the blood. The normal pH of the blood is close to 7 so the pH of the small intestine is 7.4.
The acidic environment of the stomach helps break down foodstuffs that was ingested and also kills potential bacteria. The alkaline environment of the intestines facilitates the absorption of nutrients.
Alkaline pancreatic juices are secreted into the small intestine and neutralize the acidic chyme.
Ibuprofen is mostly absorbed in the duodenum (small intestine). It cannot be absorbed through the lining of the stomach due to its low solubility in water and the low pH of stomach acid (since ibuprofen dissolves in water better at higher pH's).
Pepsin becomes inactive when it reaches the small intestine where the pH is between 7 and 9. It functions best when in an acidic environment like the stomach.
Because it is the ideal pH for enzymes in intestine to work
It has to be alkaline. As the Stomach is Acidic (pH2-3) and the Duodenum and Small Intestine are Alkaline (pH 9-10) due to the introduction of Bile from the Gallbladder.
The pH level must increase.