Natural Science

1. 4 T H P R I M A R Y
N A T U R A L S C I E N C E
FOUR SYSTEMS OF THE
NUTRITION

2. Function: To transform food in nutrients
DIGESTIVE SYSTEM

3. RESPIRATORY SYSTEM
Function: To absorb oxygen and expel carbon dioxide

4. EXCRETORY SYSTEM
 Function: To eliminate the bad substances

5. CIRCULATORY SYSTEM
Function: To transport the nutrients and the oxygen to
all the body

6. QUESTIONS
 In which system is the esophagus?
 In which system is the heart?
 In which system are the lungs?
 Which system is in charge of transforming food in
nutrients?
 Which system is in change of taking oxyging and
expeling carbon dioxide?

7. ACTIVITIES
1. Match
Digestive system
Respiratory system
Excretory system
Circulatory system
Eliminate the bad substances
Takes oxygen and expels carbon dioxide
Transport nutrients and oxygen to all the body
Transform food into nutrients
2. Classify the following words in the correct system
HEART – STOMACH – LUNGS – ARTERIES – KIDNEYS – TRACHEA – URETHRA –
ESOPHAGUS – VEIN – BLADDER – BRONCHI – LARGE INTESTINE
Digestive
system
Respiratory
system
Excretory
system
Circulatory
system

8. JOURNAL
1. Write three organs of each system.
Example: Excretory system – bladder,
ureters, urethra