Primary 3 Science Systems

Primary 3 Science Systems
Body System
- digestive system
- function
- It's function to
break down our
food.
- parts of the digestive system
and how they work
- mouth
- tongue
- rolls the food into a
ball,making it easier to
swallow
- teeth
- grinds and tears down our food
- saliva
- breaks down our food into
simpler substances
- gullet
- brings down the food
- stomach
- churns our food and digests
a little food
- small intestine
- digests our food into the
bloodstream
- large intestine
- passes out undigested food
- anus
- pass out our waste,faeces
- respiratory system
- function
- It's function is to help us
breathe and our exchange
of gases.
- parts of the respiratory
system and how they work
- nose
- take in air
- windpipe
- sends air to our lungs
- lungs
- helps us to exchange gases
- skeletal system
- function
- It's function is to give
our body shape
- It's function is to protect
our delicate organs
- It's function is to help us
with our movement.
- parts of the skeletal system
and how they work
- joints
- enable us to bend our body
- ribcage
- protects our heart and lungs
- skull
- protects our eyes and brain
- muscular system
- function
- It's function is to help us move.
- parts of the muscular system
and how they work
- muscles
- enable us to move
- circulatory system
- function
- It's function is transport
blood through our body
- parts of the circulatory
system and how they work
- heart
- pumps blood through our body
- veins
- transports blood
- blood vessels
- also transports blood
magnets
- types of magnets
- bar magnet
- U-shaped magnet
- rod magnet
- horseshoe magnet
- ring magnet
- button magnet
- what does a magnet have?
- poles that represent the north-south
- information
- unlike poles attract
- like poles repel
- things it can/cannot attract
- magnets can only attract
magnetic materials-magnetic
metals
- examples: iron,steel,nickel
- magnet cannot attract non-magnetic
materials-non-metals
- examples: copper,silver,aluminum
- magnets cannot attract all
metals-non-magnetic metals
- examples: wood,plastic,fabric
- magnets are usually used
in a compass.
- a compass looks like this
- a magnet when allowed to turn
freely,will point to a north-south
direction.
plant system
- leaves
- Makes food for the plant
- stem
- Transports water and food for plant
- roots
- Take in water and minerals for
plant
- holds the plant firmly
diversity
- Things
- Living Things
- animals
- mammals
- birds
- fish
- insects
- plants
- flowering plants
- reproduce by seeds
- non-flowering plants
- fern
- moss
- reproduce by spores
- fungi
- feed on dead plants and animals
- do not make their own food
- eg.mushroom,black fungus
- micro-organisim
- bacteria
- characteristics of living things
- need air,water and food
- respond to changes
- grow
- reproduce
- move by itself
- die
- non-living things
- characteristics of non-living things
- don't need air,water and food
- don't respond to changes
- don't grow
- don't reproduce
- don't die
- once alive or natural
- leather
- cotton
- wood
- never alive or man-made
- glass
- metal
- plastic
what is a system?
- each part of a system has
a function
- the parts must work together
- a system needs all parts to work
properly
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