Digestive System

Before food can be assimilated into the bloodstream, it undergoes a necessary transformation when taken into the mouth. Digestion is the intricate process whereby food molecules are chemically broken down by numerous enzymes into smaller substances. These smaller components can then be absorbed into the bloodstream and assimilated into cells for utilization.   The entire […]

Before food can be assimilated into the bloodstream, it undergoes a necessary transformation when taken into the mouth.

Digestion is the intricate process whereby food molecules are chemically broken down by numerous enzymes into smaller substances. These smaller components can then be absorbed into the bloodstream and assimilated into cells for utilization.

 

The entire digestion process occurs in the alimentary canal, comprising four major sections: the mouth, stomach, duodenum, and small intestine.

 

In the mouth, food is mixed and softened by saliva, which contains enzymes. The teeth masticate and crush the food into smaller particles. Saliva, containing mucin, lubricates the food, facilitates swallowing, and provides an alkaline medium essential for the action of ptyalin, an enzyme.

 

The stomach contains gastric juice, acidic due to hydrochloric acid (HCL). Hydrochloric acid serves three primary functions: halting the action of ptyalin from the mouth, providing the acidic medium required for rennin and pepsin activity in the stomach, and destroying any accompanying bacteria from the mouth.

 

From the stomach, digested products pass into the duodenum. Pancreatic juice, secreted from the pancreas, and bile from the liver, emptied into the duodenum through the bile duct, play crucial roles. Bile, lacking enzymes, emulsifies fats or oils in the chyme.

Pancreatic juice contains enzymes for carbohydrate, protein, and fat splitting:

  1. Amylase converts starch to maltose.
  2. Trypsin converts protein to peptides and peptones.
  3. Lipase converts fats to fatty acids and glycerol.

Related Posts:

Dietary Deficiency

Mineral Elements | Macro Elements, Micro Elements & Water

Vitamins

Fats And Oils

Proteins

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top