The document describes the human body's main systems including: the locomotor system made up of 206 bones that form the skeleton and muscles that contract and relax to enable movement; the five senses of sight, hearing, smell, taste and touch; and the nervous system containing the brain and nerves.

1. natural

2. Interaction
Our bodies have three parts: head, torso and limbs.
head
neck
arm
hand
shoulder
elbow
leg
foot
ear
nose

3. Our locomotor system
Our locomotor system is made up of bones and muscles.
BONES MUSCLES
 Bones are hard and rigid.
 Bones form the skeleton.
 Muscles are soft and elastic.
 Muscles contract and relax.

4. Our bones
206 bones form the skeleton. Bones are hard and rigid.
skull
ribs
spine
hip
humerus
femur

5. Our muscles
Muscles contract and relax. Muscles help us move.
biceps
pectoral muscles
gluteus
quadriceps
abdominal muscles
calf muscles

6. Our joints
Joints make the skeleton flexible. Joints help us move.
The wrist is a joint in the leg.
The knee is a joint in the arm.
The elbow is a joint in the arm.
The ankle is a joint in the leg.
The shoulder is a joint in the leg.
wrist
knee
elbow
ankle
shoulder
Are these sentences true or false?
FALSE!
FALSE!
FALSE!
TRUE!
TRUE!

7. Our senses
We have five senses: sight, hearing, smell, taste and touch.
Which sense do they use?
sight smell
hearing taste
touch

8. Our nervous system
The brain and the nerves are part of our nervous system.
Can you order this sequence?