14
What systems do living things have?
Living things
Animal bodies are made up of several systems, for example,
the digestive system and the respiratory system. Animals
and human beings carry out the basic life processes of
interaction, nutrition and reproduction with these systems.
Nutrition
Some of our systems take in, use and transform
the substances that we need to live and grow.
Our digestive system uses the food and drink we
eat or drink to provide energy for our muscles.
The respiratory system absorbs oxygen and the
circulatory system transports it to our muscles
so we can move and grow.
Interaction
Some of our systems detect information
about the world and enable us to react to that
information. The sense organs, the nerves and
the brain form the nervous system: it detects
information. The muscular and skeletal systems
enable us to react to that information.
1
What basic life processes does each picture show?
a)
b)
G
E T T I N G S T A R T E D
Respiratory system
Digestive system
Circulatory system
Skeletal system
Muscular system
Nervous system
