Process of Digestion

We will discuss about the process of digestion and what happens to the undigested food.

Digestion starts in the mouth. The food is first broken into smaller pieces by our teeth when we chew it. The sharp teeth in front help us to bite and cut the food into smaller pieces. The back teeth are flat and help to grind the food into a paste.

Process of Digestion

The saliva is a digestive juice made by the salivary glands that mixes well with the food while chewing. 

This softens the food so that the food can be easily swallowed. Saliva also starts breaking down starches into simpler soluble substances. Our tongue helps to mix the food with the saliva, and to push the food into the food pipe.

From mouth digestion continues in the stomach. The food goes to the stomach through the food pipe. The stomach muscles churn the food with more digestive juices. They break down proteins and other substances into simple soluble substances. The food remains in the stomach for upto three hours.

From the stomach, the food goes into a pipe called the small intestine. Here the food is mixed with more digestive juices and breaks down further. Some of these juices are made in the small intestine. Others are made in other body organs such as the liver and pancreas. These juices complete the digestion of food.

The food is now in a simple soluble form. It is absorbed into the blood through the walls of the small intestine. The blood takes it to all the cells in the body and then the digestion is completed in the small intestine.

So, digestion starts in the mouth, continues in the stomach and is completed in the small intestine.

Undigested food is thrown out of the body. Some parts of food cannot be digested by the body. They pass into a pipe called the large intestine. Here water is absorbed from the undigested food. The solid part is thrown out of the body as waste through the openings called the anus.

Fourth Grade

From Process of Digestion to HOME PAGE

New! Comments

Have your say about what you just read! Leave me a comment in the box below.

Recent Articles

  1. Respiratory Balance Sheet | TCA Cycle | ATP Consumption Process

    Feb 18, 24 01:56 PM

    ATP Synthase in Mitochondria
    The major component that produced during the photosynthesis is Glucose which is further metabolised by the different metabolic pathways like glycolysis, Krebs cycle, TCA cycle and produces energy whic…

    Read More

  2. Electron Transport System and Oxidative Phosphorylation | ETC |Diagram

    Feb 04, 24 01:57 PM

    Electron Transport Chains
    It is also called ETC. Electron transfer means the process where one electron relocates from one atom to the other atom. Definition of electron transport chain - The biological process where a chains…

    Read More

  3. Tricarboxylic Acid Cycle | Krebs Cycle | Steps | End Products |Diagram

    Jan 28, 24 12:39 PM

    Aerobic Respiration
    This is a type of process which execute in a cyclical form and final common pathway for oxidation of Carbohydrates fat protein through which acetyl coenzyme a or acetyl CoA is completely oxidised to c…

    Read More

  4. Aerobic Respiration | Definition of Aerobic Respiration | Glycolysis

    Dec 15, 23 08:42 AM

    Aerobic Respiration
    This is a type of respiration where molecular free oxygen is used as the final acceptor and it is observed in cell. Site of Aerobic Respiration - Aerobic respiration is observed in most of the eukaryo…

    Read More

  5. Fermentation | Definition | Types of Fermentation | Application

    Nov 29, 23 10:27 PM

    Definition of fermentation- It is a process that is energy yielding process of anaerobic oxidation of organic compounds which are carried out by the enzyme action of micro organisms where neither gase…

    Read More