Note on Digestive System

  • Note
  • Things to remember
  • Videos
  • Exercise
  • Quiz


Digestion is the breaking down of food into forms that our bodies can use. Our body uses food as fuel to provide energy for work, play and growth. Your digestive system is responsible for converting the food we eat into energy for our bodies to use.

Digestive System
Digestive System

Digestion or the breaking down of food into small molecules that will be absorbed into our bloodstream begins when you put food in your mouth and begin to chew. Your teeth help to break the food apart, saliva helps to soften the food and your tongue helps to push the food into your throat when you are ready to swallow.

When we swallow the food goes into a tube called the esophagus. The esophagus is a muscular tube that is connected to the stomach. The muscles that surround the esophagus help to squeeze and push the food into the stomach. The process by which food moves down the esophagus is called peristalsis.

We can swallow upside down because the muscles around the esophagus are strong enough to push the food up to your stomach.


The stomach is a sack that receives the food from the esophagus. Your stomach is located just below the heart. The stomach makes digestive juices (acids and enzymes) that help to break our food down into a thick liquid or paste. This thick liquid or paste is called chyme. Your stomach is a muscular organ that is able to move in order to mix the food with digestive juices. Food usually remains in the stomach for about two hours.

Stomach
Stomach


After leaving the stomach the food enters the small intestine. Your small intestine is a 20-25 feet tube that is coiled up in your abdomen. The center of your small intestine is right behind your belly button. The most important part of digestion takes place in the small intestine. As the thick liquid food paste travels through your small intestine the nutrients (vitamins, minerals, proteins, carbohydrates and fats) are absorbed by millions of tiny finger-like objects called villi and sent into your bloodstream where the nutrients can travel to all your body cells.

Our body does not digest all of the food that we eat. The undigested food leaves the small intestine and then enters the large intestine. The large intestine is about five feet long so it is shorter than the small intestine. The large intestine is however, thicker or wider than the small intestine and that is why it is called the large intestine.

The undigested food enters the large intestine as a liquid paste. In the large intestine, water is removed from the liquid paste turning what is left into solid waste. Remember, liquid paste to solid waste. The solid waste then collects in the rectum at the end of the large intestine and will finally leave the body through an opening called the anus.

Stomach growling occurs when the stomach receives signals from your brain to begin digestion but the stomach is empty. Your brain might sense you're running low on energy (glucose) or even seeing or smelling something you want to eat can get things going. The motion of the stomach muscles begins, but the organ is hollow. The movement of the muscles mixing the acids of the stomach in the hollow space of the stomach produces vibrations we hear as growling, or rumbling, or gurgling.

The obvious solution is to eat, but this is not always practical. Because your body responds to things that you do daily I suspect that people who eat on very regular schedules may be more susceptible to this problem. For example, if the stomach receives food at noon every day then the body will expect food at noon, whether food is present or not.

  • Digestion or the breaking down of food into small molecules that will be absorbed into our bloodstream begins when you put food in your mouth and begin to chew.
  • When we swallow the food goes into a tube called the esophagus.
  • The stomach is a sack that receives the food from the esophagus.
  • The stomach makes digestive juices (acids and enzymes) that help to break our food down into a thick liquid or paste called chyme.
  • The most important part of digestion takes place in the small intestine.
  • The undigested food leaves the small intestine and then enters the large intestine.
  • The solid waste then collects in the rectum at the end of the large intestine and will finally leave the body through an opening called the anus.
.

Very Short Questions

Our body does not digest all of the food that we eat. The undigested food leaves the small intestine and then enters the large intestine.

Stomach growling occurs when the stomach receives signals from your brain to begin digestion but the stomach is empty. Your brain might sense you're running low on energy (glucose) or even seeing or smelling something you want to eat can get things going. The motion of the stomach muscles begins, but the organ is hollow. The movement of the muscles mixing the acids of the stomach in the hollow space of the stomach produces vibrations we hear as growling, or rumbling, or gurgling.

The different organs which are involved in the digestion of food are as follows,

  • Mouth
  • Oesophagus
  • Stomach
  • Liver/Gall Bladder
  • Pancreas
  • Small intestine
  • Large intestine

0%
  • Where does the digestive system start?

    Anus
    Intestine
    Mouth
    Stomach
  • Which acid converts the food into chyme?

    Sulphuric Acid
    Nitric Acid
    Hydrochloric Acid
    Organic Acid
  • What is the function of colon?

    Breaks down food
    Converts food into smaller particals
    Breaks down pancreatic juice
    Absorbs water and produces mucus
  • Food that enters into the esophagus is called?

    dissolved food
    acid
    chyme
    Bolus
  • Bolus when mixed with hydrochloric acid forms _________.

    adicic food
    acidic bolus
    enzymatic food
    chyme
  • Villi are the projections found in _________.

    large intestine
    esophagus
    small intestine
    stomach
  • What is the digestive system?

    The body's breathing system
    The body's blood-transporting system
    The body's system of nerves
    The body's food-processing system
  • The process by which the foods moves down the oesophagus is called

    Excretion
    Circulation
    Peristalsis
    Digestion
  • Foods usually remains in the stomach for

    8 hours
    1 hours
    3- 4 hours
    2 hours
  • The most important part of digestion takes place in the

    Mouth
    Small intestine
    Oesophagus
    Large intestine
  • Small intestineis about

    20- 25 feet long
    40 feet long
    30- 35 feet long
    6 feet long
  • What is the role of saliva in digestion of food?

    It makes food basic
    It break down foods into small pieces
    It soften the food
    It makes food hard
  • Which one the following is not the part of digestive system?

    Stomach
    Small intestine
    Lungs
    Oesophagus
  • Which one of the following is the part of digestive system?

    Trachea
    Nose
    Larynx
    Stomach
  • The large intestine is about

    5 feet long
    9 feet long
    7 feet long
    10 feet long
  • The esophagus is a muscular tube that is connected to the

    Anus
    small intestine
    Large intestine
    Stomach
  • You scored /16


    Take test again

DISCUSSIONS ABOUT THIS NOTE

You must login to reply

Forum Time Replies Report
Abc

Ask any queries on this note.Differences between digestion and ingestion


You must login to reply

Differences between digestion and ingestion

Ask any queries on this note.


You must login to reply


You must login to reply

Differences between digestion and ingestion


You must login to reply