Science
Revision
Grade 4
Topic 1
Living
things!
Bones and Skeletons
Why we need a Skeleton
Skeletons and Movement
Different Skeletons
Medicines and Infectious Diseases
Bones and Skeletons
Bones are
attached
to muscles!
Humans
have 206
bones!
Bones are
hard and
strong!
What is a
Skeleton?
A strong
frame that
supports our
body from
the inside
Why do we need skeletons?
T
C
E
T
O
R
P
TO
HELPS US M
OVE
FUNCTION: What job does it do?
TO GI
VE SH
APE
W
O
R
G
S
U
S
P
HEL
Skeletons and
Movement
Bones can’t
bend so we
need muscles
to connect to
bones
We have 2 pairs of muscles:
To move the arm up,
To move the arm down,
One muscle (Green)
CONTRACTS
The top muscle (Green)
RELAXES
The opposite muscle (Pink)
RELAXES
The bottom muscle (Pink)
CONTRACTS
Movement:
Helps your heart and lungs work better
Makes muscles and bones stronger
Lets you stretch your body
Helps your body fight illnesses
Helps you think better
Puts you in a good mood
Movement helps our
body in so many ways!
VERTABRATES are
animals with a
backbone
INVERTABRATES are animals without
a backbone
THEY HAVE EXOSKELETONS
(A skeleton on the outside of their
body)
IDENTIFICATION KEYS
Help us sort and identify organisms
Different kinds
of skeletons
Medicines and
Diseases
We take medicines to help
make us better.
Some medicines prevent us
from getting sick
An infectious disease is
caused by germs (tiny living
things)
Germs infect your body and
make you ill.
How we take medicine:
Injections
Vaccinations
Inhale
Creams and Ointments
Drip
Syrup
Pills
ALWAYS READ THE
INSTRUCTIONS ON
MEDICATION
Happy
Studying!