Close sidebar
Skip to content

The food taken into our mouth requires some kind of alteration before they can be absorbed into the blood stream.

Digestion is the process by which food molecules are broken down into various small substances that can be absorbed into the blood stream and assimilated into the cells for utilization. Digestion is mainly a chemical process brought about by the action of many enzymes.

The whole process of digestion takes place in the ALIMENTARY CANAL, which takes place in four major sections that is, the mouth, stomach, duodenum and small intestine.

The mouth: In the mouth, the food is mixed and softened with the saliva secreted by many enzymes and masticated and crushed into smaller particles by the teeth. Saliva contains mucin which lubricates the food and makes swallowing easier, it also provides an alkaline medium necessary for the action of ptyalin, an enzyme.

The stomach contains gastric juice which is acidic due to the presence o of hydrochloric acid [HCL].The hydrochloric acid performs three major functions viz:Stops the action of ptyalin from the mouth.

See also  FOOD SERVICES

2.provides the acidic medium necessary for the action of rennin and pepsin in the stomach.

3.Destroys any bacteria that might have accompanied the food           from the mouth.

From the stomach, the product of digestion are passed into the duodenum. The pancreatic juice from     the pancreas is secreted into the duodenum and the    bile from the liver are emptied into the duodenum through the bile duct. The bile does not contain any enzyme rather it emulsifies the fats or oils present in the chime.

See also  Relationship between food and nutrition to other subjects

The pancreatic juice on the other hand contains carbohydrate, protein, and fat splitting enzymes.

Amylase– converts starch to maltose

Trypsin– converts protein to peptides and peptones.

Lipase–converts fats to fatty acid glycerol.

 

See also

DIETARY DEFICIENCY

MINERAL ELEMENTS

Vitamins

FATS AND OILS

PROTEINS

SUBSCRIBE BELOW FOR A GIVEAWAY

Building & maintaining an elearning portal is very expensive, that is why you see other elearning websites charge fees. Help to keep this learning portal free by telling mum or dad to donate or support us. Thank you so much. Click here to donate

Leave a Reply

Your email address will not be published.

error: Content is protected !!