ICSE Class 9 Answered
WHAT IS STOMACH
Asked by rajesh.rasale | 20 Aug, 2015, 08:17: PM
Expert Answer
- Stomach is a J-shaped muscular, bag-like organ of the digestive system. It is located on the left side in the abdominal cavity below the diaphragm.
- The stomach receives food from the oesophagus and opens into the small intestine.
- The stomach is lined internally by a mucous membrane. It contains several glands known as gastric glands. The gastric glands are responsible for the secretion of gastric juice and mucin.
- The gastric glands release three gastric juices—hydrochloric acid, enzyme pepsin and mucus.
- Hydrochloric acid gets mixed with food and kills the bacteria present in food. It also destroys the structure of proteins so that the enzymes can digest them easily. Hydrochloric acid also creates acidic conditions necessary for the action of the enzyme pepsin. It activates pepsin to act on proteins.
- Pepsin is first secreted as pepsinogen, which is then changed to pepsin by hydrochloric acid. Pepsin breaks down proteins into peptones and proteoses. Pepsin can digest proteins only in an acidic medium. Alkaline conditions do not allow pepsin to digest proteins.
- Mucus is a slimy fluid. It is secreted by all regions of the gut.
Answered by Hemangi Binny | 21 Aug, 2015, 08:50: AM
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