Study P3 Science Science - Systems - Geniebook

Systems

In this article, you will be introduced to the concept of what a system is according to the Singapore Primary 3 Science Syllabus. We will also be looking at the different types of body systems that are found in the human body.

 

What is a system?

A system is made of two or more parts working together.  When any one part of the system stops functioning, the whole system will not be able to function properly. Systems can be found in both living and non-living things. The table below shows some examples of systems in both living and non-living things.

Systems Found In Living Things

Systems Found In Non-Living Things

plant transport system

human digestive system

human circulatory system

laptop

television

mobile phone

 

Human Body Systems

The human body is made up of different parts and systems so that the body functions effectively and efficiently to keep the human alive and healthy. 

The human body consists of the following body systems:

Human Body System

Function(s)

circulatory system

  • transports digested food, oxygen and water to the different parts of the body
  • transports carbon dioxide and waste away from different parts of the body for removal

digestive system

  • breaks food down into simpler substances
  • absorbs digested food into the body

muscular system

  • works together with the skeletal system to enable movement

respiratory system

  • allows the gaseous exchange with the atmosphere

(take in oxygen and give out carbon dioxide)

skeletal system

  • provides support for our body
  • gives our body its shape
  • protects important organs
  • works together with our muscular system to enable movement

 

Human Circulatory System

The human circulatory system consists of the heart, the blood and the blood vessels. 


Image Credits: macrovector
Human Circulatory System
 

One of the main functions of the human circulatory system is to transport oxygen, digested food and water to the different parts of the body. At the same time, it transports carbon dioxide and waste away from the different parts of the body for removal.

 

Human Digestive System

The human digestive system consists of the mouth, the gullet, the stomach, the small intestine, the large intestine and the anus. 


Image Credits: macrovector
Human Digestive System
 

The main functions of the digestive system is to digest food into simpler substances and absorb the digested food into the bloodstream.

 

Human Muscular System

The muscular system is made of different types of muscles.  Some muscles, like the muscles that are found on our arms and legs, can be controlled to enable movement. However, some muscles, such as those that make up our heart (heart muscles) and stomach (stomach muscles), cannot be controlled.  


Image Credits: macrovector -
Human Muscular System
 

Muscles work in pairs. As one muscle contracts, the other muscle relaxes. This allows the muscles to work together with our skeletal system to enable movement.

 

Human Respiratory System

The human respiratory system consists of the nose, windpipe and the lungs. 


Image Credits: macrovector -
Human Respiratory System
 

The main function of the respiratory system is to take in oxygen and give out carbon dioxide (gaseous exchange with the atmosphere). It helps us to take in the oxygen that our body needs for survival.

 

Human Skeletal System

The human skeletal system is made of 206 bones. Examples of these bones include the skull, ribcage, backbone and hipbone.  


Image Credits: macrovector -
 Human Skeletal System
 

The functions of the human skeletal system is to provide support for our body, give our body shape, protect our important organs and work together with the muscular system to enable movement. There are joints at the various parts of the skeletal system to enable the body to bend. 

 

Conclusion

In this article, we learnt about the different types of the human body systems.  We also learnt about the functions of the different body systems that are found in the human body.

 

Test Your Concepts

Answer the following questions based on the concepts that we have covered in this article. If you are unclear, you may want to revisit the relevant section to revise the concepts.

 

Question 1:

Lionel is playing soccer as shown in the picture below.

Which body systems are working together when he is playing soccer?

  1. skeletal system
  2. muscular system
  3. circulatory system
  4. respiratory system

 

  1. A and C only
  2. B and D only
  3. A, C and D only
  4. A, B, C and D

 

Solution

(4)

Explanation:

The skeletal system and muscular system work together to enable movement.  The respiratory system helps to take in the oxygen that Lionel needs and give out the carbon dioxide produced.  The circulatory system transports oxygen and digested food to his muscles to release energy for him to play soccer.


 

Question 2:

The table below shows the functions of some human body systems. 

Which of the following correctly matches the function to the human body system?

   

System

Function

 

1.

skeletal

transport digested food to all parts of the body

 

2.

muscular

gives the body its shape

 

3.

respiratory

takes in oxygen and removes carbon dioxide

 

4.

circulatory

absorb digested food into the bloodstream

 

Solution:

(3)

Explanation:

The functions of the human skeletal system is to provide support for our body, give our body shape, protect our important organs and work together with the muscular system to enable movement. The function of the muscular system is to work together with the skeletal system to enable movement. The function of the circulatory system is to transport digested food, oxygen and water to all parts of the body and transport carbon dioxide and waste away from the body for removal.


 

Question 3:

Jane wrote the following statements about the different human body systems as shown below.

  1. Our ribcage protects our lungs.
  2. The circulatory system consists of the heart, blood and blood vessels.
  3. The respiratory system consists of the mouth, gullet, lungs and stomach.
  4. The skeletal system works together with the muscular system to enable movement.

Which of the statements made by Jane are correct?

 

  1. A and D only
  2. B and C only
  3. A, B and D only
  4. A, B, C and D

 

Solution:

(3)

Explanation:

The respiratory system consists of the nose, windpipe and lungs.


 

Continue Learning
Systems Diversity Of Materials
Plants And Their Parts Living And Non-Living Things
Diversity Of Plants Digestive System
Diversity Of Animals Fungi & Bacteria

 

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