explain the process of digestion in stomach
Answers
Digestion begins in the mouth with the secretion of saliva and its digestive enzymes. ... In the stomach further release of enzymes break down the food further and this is combined with the churning action of the stomach. The partially digested food enters the duodenum as a thick semi-liquid chyme.
Answer:
When food reaches the stomach, it stays for approximately 4 to 5 hours. There are various gastric glands in the mucus lining of the stomach. The mucus neck cells secrete mucus. The Peptic Cells secrete the proenzyme pepsinogen. The Parietal or Oxyntic Cells secrete HCl (Hydrochloric acid) and intrinsic factor that is essential for vitamin B12 absorption.
Food in the stomach gets mixed thoroughly with the gastric juices through the churning movements of the stomach muscle. This mass of food that is semi-digested, acidic and pulpy is called the chyme. It is mostly the proteins that get digested in the stomach. The mucus and the bicarbonates of the gastric juice help in protecting the mucusal epithelium from the highly acidic HCl. Mucus also helps in lubricating the food.
The different chemical reactions that take place in the stomach are summarised as follows.
Gastric juices and enzymes:
HCl provides the acidic pH.
Pepsinogen(proenzyme) is converted into Pepsin by HCl
Pepsin, in turn, converts protein into peptones & proteoses.
Prorenin (proenzyme) is converted into Renin by HCl.
Casein (milk protein) is converted into peptides by Renin.
After the action of the gastric juices and enzymes, food then enters the small intestine.
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