The pH of the blood urine and extracellular fluids have norm

The pH of the blood, urine, and extracellular fluids have normal ranges that are fairly close to neutral with pH values ranging from 6 for urine to about 7.4 for blood. Identify TWO (2) other locations in the body where the pH plays an important role in the proper function of that particular structure, and explain how the pH contributes to the proper functioning the these strucutures.

Solution

pH of human body organs depends purely on their funtions. Apart from blood and Urine there are various organs in the human body where pH plays a importanat role in maintaining the function of the particular organ. First one the Saliva which is an exocrine solution and it contains 99% of water and rest 1% contains electrolytes and proteins for example salivary amylase. The pH of saliva is aproximately 6.5 to 7.5 and it has a wonderfull buffering effect. It maintains the composition of Biofilm in the mouth, Plaque pH, food retention, inorganic comppounds, acid production in mouth, remineralization of enamal by maintaining the bicarbonate level with calcium and phosphate, tissue repair and the neutralization of lactic acid produced by eating carbohydrates.A shift in the oral pH may be transient in the case of drinking an acidic beverage due to the buffering capacity of the saliva.

The second one is the pH of human stomach which has a very acidic pH of 1.5 to 3.5. When we eat something the stomach releases the acid like hydrochloric acid and some proteases. Actually the acids doesnot do much for the digestion but it provides the optimal pH for the functioning of the proteases (for example trypsin and pepsin) so that they can digest the protein consumed by the individual. The pH of stomach changes according to the food consumed. For example if we take high protein diet the pH of stomach may drop to 1 or 2 however the buffering capacity of stomach converts it to normal range of 3 or 4 and after the food is digested it comes to a resting pH of 4 or 5.