The Digestive System 2b
The Grinder-Liquidizer-Churner-Soak up Chamber
STOMACH The churner liquidizer
The stomach is a large curved bag it is partly high up in the abdomen behind the lower ribs and the liver, when empty it is small and can hold only 500 cc.
The stomach is an expandable sac that can hold up to 1.2 liter (1200cc) of food this storage capacity allows us to stay without food for 3-4 hours.
The wall of the stomach is muscular and has three layers of strong muscle that contract and relax mixing and churning the food with the digestive juices secreted by the lining of the stomach. The juices are rich in hydrochloric acid and enzymes.
About 2500 cc of stomach juice is secreted in a day. - The acid kills the bacteria and helps the enzyme pepsin.
Stomach mucosa is protected from the acid by layer of mucus. The food as a result of this mixing process looks like a frothy paste. This process of mixing can last up to three hours.
The food paste is kept in the stomach by a band of muscle, in the wall at the end stomach, called the pyloric sphincter, when it relaxes the paste now enters the duodenum in short spurts.
The stomach also secretes an intrinsic factor, a peptide. This combines with Vitamin B12 and helps in the absorption of this Vitamin.
The food paste stays in the stomach for a longer period if the food contains lots of fats.
DUODENUM Onwards to the chemical splitter
The duodenum is a tube in the form of a C and is 10 inch in length. It receives the paste like contents of the stomach.
In the duodenum, the food mixes with the juices from the liver and pancreas.
The pancreas is like a large salivary gland and secretes about 1500cc/day of juice to breakdown carbohydrates, fats and proteins.
The juices in the duodenum are alkaline to digest proteins and neutralize the acid in the gastric contents and protect the duodenal mucosa from acid injury. They also create alkaline condition to help the action of the enzymesontributiond
Any questions be sent to drmmkapur@gmail.com
All earlier posts are stored in archives for access and review
Visitors that follow the site may post contributions to the site.
Click on the image to see details
No comments:
Post a Comment