2

1 INTERACTION1Label the nervous system.

Complete the sentences about the brain using the words in the box. 2

1

a The is the most important organ of the system.

b The cerebrum controls actions: the things we want to do, such as reading.

c The controls balance, and coordination.

d The brain stem controls actions: the things we do not think about,

such as breathing.

cerebellum • voluntary • movement • involuntary • brain • nervous

163405_BMLT_3PRM_NSg_AB_Interior.indd 2 5/4/19 13:55

3

Look at the photos. Write sentences.3

a

d

b

e

c

Complete the sentences using the words in the box.4

a Light enters the eye through the .

b The light goes through the lens and makes an image on the .

c The retina sends information to the .

d Eyebrows, eyelashes and eyelids our eyes.

brain • pupil • protect • retina

pupil

Our skin is the organ we

use to touch.

163405_BMLT_3PRM_NSg_AB_Interior.indd 3 5/4/19 13:55

4

1

5 Order the sentences to explain how we hear.

How do these things feel? Use the words in the box. You can use more than one word.

Olives taste bitter.

a The brain reads the signals and tells us what we can hear.

b Sound waves enter through the outer ear.

c The waves hit the eardrum in the middle ear and make it vibrate.

d The liquid in the inner ear moves and sends signals to the brain.

hot • cold • smooth • hard • rough • soft

How do these things taste? Write sentences.6

a b c d

7

a b c

163405_BMLT_3PRM_NSg_AB_Interior.indd 4 5/4/19 13:56

5

Complete the concept map.

Look at the drawing and write the name of the correct bone.

8

9

Locomotor system

a

d

b

c

g

f

a It protects the brain in our head.

b A long bone that runs from the shoulder to the

elbow.

c Line of bones that provides support for the body.

d Curved group of bones at the base of the spine to

which the legs are attached.

e There are 24 that form a cage.

f The large bone in the upper part of the leg.

g The large bone at the front of the lower leg.

Tick only the names of muscles.10

triceps radius nerves deltoid

ribs pectorals biceps nose

abdominals brain ears heart

trapezius skull quadriceps feet

e

163405_BMLT_3PRM_NSg_AB_Interior.indd 5 5/4/19 13:56

6

1

Discover

Project work Investigate different tastes at home.

a How many food items did you guess correctly?

b Which foods and tastes did you like? Which didn’t you like?

11

Choose five items of food. Ask your mum or dad

to choose five different items of food.

Do a taste test:

• Close your eyes.

• Ask your mum or dad to pass you their food items.

• Taste them. How do they taste?

• Open your eyes. What were they?

• Ask your mum or dad to close their eyes and repeat

the test with your food items.

Write your results in the table:

1

2

3

me my mum/dad

food taste food taste

1

2

3

4

5

163405_BMLT_3PRM_NSg_AB_Interior.indd 6 5/4/19 13:56

7

Skills checkRead the text and write some words to complete the sentences below. You can use one or two words.

12

7

Our body

We know that our brain receives information from the senses organs though the nerves. Then the brain sends messages back to the rest parts of the body. For example, if you see a ball flying towards your head, your brain will send a signal to your hand to block the ball before it can hit you.

But sometimes we need to move so fast that our brain does not have time to think. For example, when we touch something hot, our hand actually moves before the brain tells it to move. These are called reflexes.

Having good reflexes help us in sports, exercise, and everyday physical activities. Some people are born with fast reflexes, and others must practice them.

a The reads the signals sent by the senses organs.

b The messages sent by our brain to the different parts of the body go through

the .

c Some help us to be safe from danger.

d If we want to have reflexes, we can practice.

163405_BMLT_3PRM_NSg_AB_Interior.indd 7 5/4/19 13:56