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The Digestive System

In this worksheet, students will explain the basic job of each organ involved in the digestive system and test their understanding of the digestive process.

'The Digestive System' worksheet

Key stage:  KS 3

Curriculum topic:  Biology: Structure and Function of Living Organisms

Curriculum subtopic:  Nutrition and Digestion

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

The digestive system is a group of organs that work together to break down food. Through this system, food is broken down into its nutrients, so that they can be absorbed and used throughout the body.

 

Each organ has a specific job to do in this process. The diagram below shows the different organs involved in the digestive system:

 

Human digestive system
 

 

So, it's lunch time, let's follow your food on its digestive journey!

 

Digestion starts:

 

In the mouth, where food is broken down into smaller pieces that can travel down the esophagus (used to be called the gullet) and into...

 

The stomach, where is it broken down further by muscle contractions, squeezing your stomach every 20 seconds to mix the food with digestive juices which helps to break it down. After a few hours the food then enters...

 

The small intestine, where vitamins, minerals and other small molecules can be easily absorbed.  Some molecules however may still be too big or may not have been digested fully or even at all. (fibre is an important part of our diet because it cannot be broken down by the body). Then on to...

 

The large intestine, where any excess water is absorbed into the body. Finally, it reaches...

 

The rectum, where any undigested food is stored before being passed through the anus as feces (waste). Out of your body and into the toilet!! 

 

Useful stuff in, useless stuff out! 

Where does the digestion of our food start?

in the rectum

in the stomach

in the small intestine

in the mouth

In which part of the digestive system is excess water absorbed into the body?

stomach

large intestine

small intestine

esophagus

Which of the following is needed in our diet but cannot always be digested in our bodies?

fats

fibre

protein

carbohydrates

Which part of the digestive system churns and mixes food with acid and enzymes to help break it down?

liver

small Intestine

stomach

rectum

Where does any undigested food and waste leave the body?  

anus

stomach

bladder

large Intestine

What is the name of the process by which insoluble food is made soluble, so that it can be absorbed into the blood stream?

respiration

excretion

digestion

The colon is another name for which digestive organ?

liver

large intestine

oesophagus

stomach

What type of molecules can be easily absorbed by the small intestine?

large molecules

small molecules

Which ONE of the following organs is not directly involved in the digestive system?

lungs

large intestine

stomach

What is the name of the tube that connects the mouth to the stomach?

appendix

esophagus

small intestine

  • Question 1

Where does the digestion of our food start?

CORRECT ANSWER
in the mouth
EDDIE SAYS
Digestion starts in the mouth, where food is broken down into smaller pieces by our teeth! What that does is to increase the food's surface area, making it easier for enzymes to reach all of it, making it easier to digest.
  • Question 2

In which part of the digestive system is excess water absorbed into the body?

CORRECT ANSWER
large intestine
EDDIE SAYS
The large intestine (or colon) is where any excess water is absorbed into our bodies. We need to retain as much water as possible.
  • Question 3

Which of the following is needed in our diet but cannot always be digested in our bodies?

CORRECT ANSWER
fibre
EDDIE SAYS
Fibre is very important for our bodies as it can help prevent diabetes, heart disease, weight gain, and it can improve our digestive health in general (such as preventing constipation as fibre gives our gut muscles something to 'push' against). Some fibres are soluble (can be digested) such as oats, fruit and vegetables, but non-soluble fibres such as wholemeal bread, nuts and cereal, cannot be digested by our bodies.
  • Question 4

Which part of the digestive system churns and mixes food with acid and enzymes to help break it down?

CORRECT ANSWER
stomach
EDDIE SAYS
This process happens in our stomach, where the stomach muscles contract to mix the food with digestive juices (acid and enzymes) in order to help break down the food. In fact, this produces a sort of 'soup' of partially digested food, called CHYME, which is now ready to be passed into the small intestine for further digestion.
  • Question 5

Where does any undigested food and waste leave the body?  

CORRECT ANSWER
anus
EDDIE SAYS
The undigested food leaves our body through the anus as feces (waste).
  • Question 6

What is the name of the process by which insoluble food is made soluble, so that it can be absorbed into the blood stream?

CORRECT ANSWER
digestion
EDDIE SAYS
This process is called digestion! Respiration is a chemical reaction that takes place in cells and excretion is the process of removing waste products from the body.
  • Question 7

The colon is another name for which digestive organ?

CORRECT ANSWER
large intestine
EDDIE SAYS
The colon is the main part of the large intestine.
The large intestine is made up of the caecum (which connects the small intestine to the large intestine), the colon and the rectum.
  • Question 8

What type of molecules can be easily absorbed by the small intestine?

CORRECT ANSWER
small molecules
EDDIE SAYS
Large molecules are too big to pass through the wall of the small intestine. That's the job of the digestive enzymes: to break those large food molecules, like proteins, into smaller ones that can pass across the gut wall and into the blood.
  • Question 9

Which ONE of the following organs is not directly involved in the digestive system?

CORRECT ANSWER
lungs
EDDIE SAYS
The lungs are not directly involved in the digestive system; they are part of the respiratory system and are involved in breathing.
  • Question 10

What is the name of the tube that connects the mouth to the stomach?

CORRECT ANSWER
esophagus
EDDIE SAYS
The esophagus (once known as the gullet) connects the mouth to the stomach.
The appendix is a little worm-shaped structure attached to the large intestine - it doesn't have much of a function in humans (apart from to cause a lot of pain if it bursts!). The small intestine is where nutrients are absorbed into our bloodstream.
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