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Describe the Digestive System

In this worksheet, students will describe the digestive system.

Worksheet Overview

QUESTION 1 of 10

Did you know that your small intestines are about 7 meters long?! And your large intestine is about 1.5 meters long! The intestines form part of our digestive system. The digestive system is an example of an organ system. You can see some of the different systems in the picture below:

Image of different body systems

 

Cells are the basic building blocks of all living organisms. They come in different sizes and shapes. Some organisms are made of just one cell and are called unicellular, while other organisms are multicellular – they are made up of many types of cells. Cells work together to carry out different life processes, like digestion, which is needed for an organism to stay alive.

 

Each specific cell is grouped with other cells similar in structure and function to form tissues. Groups of tissues work together to form organs that have specific functions. Organs are organised into organ systems, which work together to form organisms

 

Image of plant cell to organism

In the above image, the first image shows a leaf cell. The leaf cells group together to form a tissue, the tissues work together to form an organ, the leaf. The leaf and other organ systems work together to form the plant (an organism).

 

Organisation of the body allows complex organisms to carry out many different jobs at the same time.

The delicious burger and chips you ate for lunch have to be broken down in order for your body to use it. This breaking down of food is called digestion. The different organs that help with digestion are called the digestive system.  

Image of the digestive system

While chewing our food into smaller pieces, our food mixes in with our saliva. You wouldn’t think it, but our saliva is pretty special because it makes our food moist and easy to swallow, but also has something called enzymes, which help to break our food up.   

Your burger and chips are now mashed up and swallowed. This moves down through the oesophagus (the pipe connecting your mouth to your stomach) into your stomach.

In the stomach the food is churned up, breaking it up even more. It also mixes with strong acid found in the stomach. This destroys microbes.

From the stomach, food enters the small intestine and the small digested food molecules are absorbed into the bloodstream. Larger molecules won’t be digested and certain foods, like fibre, we can’t digest.

After the small intestine, the remains of the food travels to the large intestine. All that is left of the burger and chips is water and waste material.

The water is valuable, so it’s absorbed from the large intestine into the bloodstream. The kidneys also help to make sure we have the right amount of water in our body.

The waste material can’t be digested or used by the body. The undigested waste travels to the rectum where it is stored until leaving the body through the anus as faeces.

 

In the following activity, you will describe the different organs that make up the digestive system.

Living organisms have to carry out many living processes, for example, respiration and digestion. Living organisms need to have systems in order to carry out these processes.

 

Fill in the blanks below to describe how these systems are formed from cells.

Image of plant cell to organism

Cells are the basic building blocks of all living organisms. Link the different groups to their definitions.

Column A

Column B

Cell
Groups of organs which work together to form organ...
Tissue
Cells grouped with other cells similar in structur...
Organ
Groups of tissues working together with specific f...
Organ System
Building blocks of all living organisms

Image of the digestive system

 

The oesophagus has an important role to play in digestion.

 

What is the function of the oesophagus? Select one answer below. 

 

To break food into smaller pieces

To allow nutrients to be absorbed

To allow food to be moved to the stomach

Digestion occurs in stages. Below is a list of the different parts of the digestive system. Put the different parts in order, starting with the one that comes first.

 

Select one answer in each row.

What is the job of the acid found in the stomach? Complete the sentence by typing one word below. 

 

The job of the acid found in the stomach is to destroy...

Image of the digestive system

Which part of the digestive system is water absorbed from? Type one letter from the picture above.

Which process does not happen in the stomach? Select one answer below.

Image of the stomach digesting food

Food is churned and further broken up

Food is mixed with acid

Fibre is made

 Are the following statements true or false? Select one answer in each row.

Peter and Paul are discussing the digestive system for a class project. Peter says that our digested food molecules are absorbed in the large intestine, whereas Paul says that the small digested food molecules are absorbed into the bloodstream in the small intestine. 

 

Who is correct, Peter or Paul? Select one answer below.

 

 

Peter

Paul

They are both correct

Small digested molecules get absorbed into the bloodstream, where they will be used by different parts of the body.

 

What happens to the undigested food? Fill in the blanks below to answer this question.

Peter

Paul

They are both correct

  • Question 1

Living organisms have to carry out many living processes, for example, respiration and digestion. Living organisms need to have systems in order to carry out these processes.

 

Fill in the blanks below to describe how these systems are formed from cells.

CORRECT ANSWER
EDDIE SAYS
How did you do? An easy way to visualise this is: Cell → Tissue → Organ → Organ System
  • Question 2

Image of plant cell to organism

Cells are the basic building blocks of all living organisms. Link the different groups to their definitions.

CORRECT ANSWER

Column A

Column B

Cell
Building blocks of all living org...
Tissue
Cells grouped with other cells si...
Organ
Groups of tissues working togethe...
Organ System
Groups of organs which work toget...
EDDIE SAYS
Try to remember the below: Cell → Tissue → Organ → Organ System Cells make up the tissues, tissues make up the organ, organs work together to make an organ system.
  • Question 3

Image of the digestive system

 

The oesophagus has an important role to play in digestion.

 

What is the function of the oesophagus? Select one answer below. 

 

CORRECT ANSWER
To allow food to be moved to the stomach
EDDIE SAYS
The muscles in the oesophagus contract in a wave-like motion to help food move along to the stomach, where the next stage of digestion occurs.
  • Question 4

Digestion occurs in stages. Below is a list of the different parts of the digestive system. Put the different parts in order, starting with the one that comes first.

 

Select one answer in each row.

CORRECT ANSWER
EDDIE SAYS
In case you need help remembering the order: MOSSILIRA Mouth Oesophagus Stomach Small Intestine Large Intestine Rectum Anus
  • Question 5

What is the job of the acid found in the stomach? Complete the sentence by typing one word below. 

 

The job of the acid found in the stomach is to destroy...

CORRECT ANSWER
Microbes
Pathogens
Bacteria
Microorganisms
EDDIE SAYS
Don't worry if you found that tricky! The acid in the stomach is very strong - it has a pH between pH 1-2. Luckily, we have a protective layer inside of our stomachs to stop the acid from wearing our own stomach away!
  • Question 6

Image of the digestive system

Which part of the digestive system is water absorbed from? Type one letter from the picture above.

CORRECT ANSWER
E
EDDIE SAYS
E is the large intestine. F is pointing to the rectum where waste is stored and G is the anus, where faeces is removed from.
  • Question 7

Which process does not happen in the stomach? Select one answer below.

Image of the stomach digesting food

CORRECT ANSWER
Fibre is made
EDDIE SAYS
The stomach has two main jobs: It's responsible for the chemical breakdown of food and destroying bacteria found on any food, using strong acid.
  • Question 8

 Are the following statements true or false? Select one answer in each row.

CORRECT ANSWER
EDDIE SAYS
The oesophagus leads food to the stomach, which has acid in it to destroy microbes that might be present on the food that's been eaten. The small intestine is actually really long, but is coiled up so it fits into our body. The food molecules are small enough to pass through the folds of the small intestine. Good work, that's another activity completed!
  • Question 9

Peter and Paul are discussing the digestive system for a class project. Peter says that our digested food molecules are absorbed in the large intestine, whereas Paul says that the small digested food molecules are absorbed into the bloodstream in the small intestine. 

 

Who is correct, Peter or Paul? Select one answer below.

 

 

CORRECT ANSWER
Paul
EDDIE SAYS
Good work if you sided with Paul! The small intestine is where the absorption of important food molecules into the blood occurs, whereas the large intestine deals with the undigested and waste material.
  • Question 10

Small digested molecules get absorbed into the bloodstream, where they will be used by different parts of the body.

 

What happens to the undigested food? Fill in the blanks below to answer this question.

CORRECT ANSWER
EDDIE SAYS
Undigested food has no nutritional value, as all the nutrients and useful molecules have been removed. Water is reabsorbed in the large intestine too.
---- OR ----

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