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W-76 Why Do We Eat Food?
People eat food every day.
People need food to live.
Food gives energy to the body.
The body needs energy to move.
The body uses energy to work.
Food goes into the mouth.
The mouth chews the foo...
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W-65 Why Do We Sleep?
People sleep every day.
People need sleep to live.
Sleep helps the body rest.
The body works all day.
The body gets tired.
Sleep gives energy back.
The brain rests in sleep.
The brain needs res...
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W-65 How Do We Breathe?
People breathe every day.
People need air to live.
Air has oxygen inside.
The body needs oxygen.
People breathe in air.
Air goes into the nose.
Air goes into the lungs.
Lungs are soft body part...
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W-55 Why Do We Blink?
People blink every day.
People have eyes.
Eyes help people see.
Eyes need water to stay wet.
Blinking moves water on eyes.
Water keeps eyes clean.
Blinking stops dust.
Dust can hurt eyes.
Blin...
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W-59 Why Do We Sweat?
People sweat every day.
People have skin.
The body makes heat.
Heat makes the body hot.
The body needs to cool down.
Sweat comes out of the skin.
Sweat is water.
Water goes on the skin.
Water ...
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6
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W-64 How Does the Heart Work?
People have a heart.
The heart is inside the body.
The heart is a strong muscle.
The heart moves all the time.
The heart pumps blood.
Blood moves in the body.
Blood carries oxygen.
Oxygen goes ...
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7
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W-54 What Do Bones Do?
People have bones.
Bones are inside the body.
Bones are hard parts.
Bones hold the body up.
Bones give the body shape.
Bones help people stand.
Bones help people move.
Bones protect soft parts....
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8
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W-63 Why Do We Drink Water?
People drink water every day.
People need water to live.
The body has water inside.
Water helps the body work.
Water moves in the body.
Water helps carry things.
Water helps the body cool down.
...
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9
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W-52 How Do Muscles Move Us?
People have muscles.
Muscles are inside the body.
Muscles are soft parts.
Muscles can move.
Muscles pull bones.
Bones move with muscles.
Muscles work in pairs.
One muscle pulls.
The other musc...
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10
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W-58 Why Do We Feel Hungry?
People feel hungry every day.
The body needs food.
Food gives energy.
The body uses energy all day.
Energy goes down.
The stomach feels empty.
The stomach sends a message.
The brain gets the me...
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11
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W-64 Why Do We Feel Thirsty?
People feel thirsty every day.
The body needs water.
Water is inside the body.
The body uses water all day.
Water goes out of the body.
The body has less water.
The body sends a message.
The br...
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12
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W-50 How Do We Walk?
People walk every day.
People use their legs.
Legs have muscles.
Muscles pull bones.
Bones move the legs.
One leg moves forward.
The other leg stays back.
Feet touch the ground.
The body stays...
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13
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W-58 Why Do We Have Teeth?
People have teeth.
Teeth are in the mouth.
People eat food every day.
Teeth help bite food.
Teeth help chew food.
Chewing breaks food.
Small food is easy to swallow.
Food goes to the stomach.
...
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W-56 How Do We Chew Food?
People chew food every day.
Food goes into the mouth.
Teeth touch the food.
Teeth bite the food.
Teeth break the food.
The jaw moves up and down.
The tongue moves the food.
Chewing makes food s...
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W-50 Why Do We Have Skin?
People have skin.
Skin covers the body.
Skin protects the body.
Skin keeps germs out.
Skin helps hold water in.
Skin feels hot and cold.
Skin feels touch and pain.
Skin helps the body stay safe...
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W-57 How Do Eyes Help Us See?
People have eyes.
Eyes help people see.
Light goes into the eyes.
Light comes from things.
The eyes catch the light.
The light goes to the brain.
The brain reads the light.
The brain makes pict...
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W-63 Why Do We Have Hair?
People have hair on the body.
Hair grows from the skin.
Hair keeps the body warm.
Hair holds heat on the skin.
Warm skin helps the body work.
Hair also protects the body.
Hair blocks strong sun....
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18
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W-98 How Do Ears Hear Sound?
Sound is all around us.
Sound comes from moving things.
The movement makes sound waves.
Sound waves move in the air.
Ears catch the sound waves.
The ear has three main parts.
The outer ear catch...
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W-76 Why Do We Yawn?
People yawn every day.
We yawn when we feel tired.
We also yawn when we are bored.
Yawning opens the mouth wide.
Air moves into the body.
The body gets more oxygen.
Oxygen helps the brain work.
...
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W-68 Why Do We Cough?
People cough sometimes.
We cough to protect the body.
Air goes into the body.
Sometimes dust goes in too.
Dust goes into the throat.
The throat feels danger.
The body wants the dust out.
The bo...
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21
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W-75 How Do Hands Help Us?
Hands are parts of the body.
People use hands every day.
Hands help us hold things.
We hold food with hands.
We hold tools with hands.
Hands help us pick things up.
Fingers can bend and move.
M...
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22
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W-68 Why Do We Have Fingers?
People have fingers on the hands.
Fingers are small body parts.
Fingers help us hold things.
We hold food with fingers.
We hold pencils with fingers.
Fingers help us pick up small things.
Finger...
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23
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W-59 How Do Feet Help Us Walk?
Feet are parts of the body.
People have two feet.
Feet touch the ground.
Feet support the body.
The body stays upright.
Feet help us keep balance.
Feet move one by one.
One foot steps forward.
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24
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W-73 Why Do We Have a Nose?
People have a nose on the face.
The nose helps us breathe.
Air goes into the nose.
The nose warms the air.
Warm air helps the lungs.
The nose also cleans the air.
Nose hair stops dust.
Dust sta...
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25
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W-77 How Do We Smell Things?
Smell is all around us.
Things give off tiny bits.
The tiny bits move in the air.
We breathe air into the nose.
The tiny bits go into the nose.
The nose has smell cells inside.
Smell cells catch...
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26
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W-75 Why Do We Have a Mouth?
People have a mouth on the face.
The mouth helps us eat food.
Food goes into the mouth.
Teeth break the food.
The tongue moves the food.
The mouth helps us swallow.
Food goes to the body.
The b...
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27
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W-65 How Do We Taste Food?
Taste comes from food.
Food goes into the mouth.
The tongue touches the food.
The tongue has taste buds.
Taste buds are small parts.
They taste sweet and salty.
They also taste sour and bitter.
...
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28
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W-64 Why Do We Get Tired?
People get tired every day.
We use the body all day.
The body moves and works.
Working uses energy.
Energy comes from food.
Energy can run low.
The muscles feel tired.
The brain feels tired too...
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W-74 How Do We Rest?
People rest every day.
We rest when the body feels tired.
Rest means slowing the body down.
We stop moving for a while.
The muscles relax.
The heart beats more slowly.
We sit or lie down.
Quiet...
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W-72 Why Do We Need Sleep at Night?
People sleep at night.
Night is quiet and dark.
The body stops working hard.
Sleep helps the body rest.
The muscles relax at night.
The heart beats more slowly.
Sleep helps the brain rest too.
...
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31
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W-64 Why Do We Stretch?
People stretch every day.
We stretch after we wake up.
We also stretch after sitting long.
Stretching moves the body.
The muscles become tight.
Stretching makes muscles longer.
Long muscles move...
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32
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W-70 How Do We Sit and Stand?
People sit and stand every day.
The body changes position.
To sit, the body moves down.
The knees bend slowly.
The hips bend too.
The body lowers onto a seat.
Muscles control the movement.
To s...
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33
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W-71 Why Do We Laugh?
People laugh every day.
We laugh when we feel happy.
We also laugh with friends.
Laughing starts in the brain.
The brain feels something funny.
The brain sends signals.
The mouth opens and makes...
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W-70 Why Do We Cry?
People cry sometimes.
We cry when we feel sad.
We also cry when we feel hurt.
Crying starts in the brain.
The brain feels strong emotions.
The brain sends signals.
The eyes make tears.
Tears co...
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W-71 How Do We Feel Pain?
Pain helps protect the body.
Pain starts in the body.
The skin feels something wrong.
It can be hot or sharp.
Special cells feel the danger.
The cells send pain signals.
The signals move through...
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36
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W-67 Why Do We Feel Cold?
People feel cold sometimes.
Cold comes from low temperature.
Cold air touches the skin.
The skin feels the cold.
Special cells feel temperature.
The cells send signals.
The signals go to the bra...
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W-70 How Do We Stay Warm?
People stay warm in cold weather.
Cold air touches the skin.
The skin feels the cold.
The body knows it is cold.
The brain sends signals.
The body tries to make heat.
The body makes us shiver.
...
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W-73 Why Do We Wash Hands?
People wash hands every day.
Hands touch many things.
Some things have germs.
Germs are very small.
Germs can get on hands.
Hands touch the face and mouth.
Germs can go into the body.
Washing h...
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W-62 How Does Soap Clean?
Soap helps clean the body.
Dirt sticks to the skin.
Germs also stick to the skin.
Many germs have oily coats.
Water cannot remove oil well.
Soap mixes with oil.
Soap breaks the oil apart.
The d...
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40
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W-69 Why Do We Brush Teeth?
People brush teeth every day.
Teeth help us chew food.
Food stays on the teeth.
Tiny germs live on food.
Germs make sticky plaque.
Plaque stays on the teeth.
Plaque can hurt the teeth.
It can m...
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41
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W-69 How Do We Grow Taller?
People grow taller over time.
The body grows little by little.
Bones are inside the body.
Bones can grow longer.
The legs and spine grow.
Growth happens mostly at night.
The body rests during sl...
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42
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W-71 Why Do Children Grow?
Children grow every year.
Their bodies are still growing.
The body wants to get bigger.
Bones grow longer inside the body.
Muscles grow with the bones.
The brain tells the body to grow.
The body...
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W-67 How Do We Stay Healthy?
People want to stay healthy.
The body needs good care.
We eat healthy food.
Food gives energy to the body.
We drink clean water.
Water helps the body work.
We move the body every day.
Exercise ...
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44
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W-73 Why Do We Need Exercise?
People need exercise every day.
Exercise means moving the body.
The body moves and uses energy.
Exercise makes muscles strong.
Strong muscles help us move well.
Exercise helps the heart work.
Th...
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45
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W-68 How Does Water Help Our Body?
Water is very important.
The body has a lot of water.
We drink water every day.
Water moves inside the body.
Water helps blood move.
Blood carries oxygen and food.
Water helps control body heat....
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46
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W-69 Why Do We Feel Full?
People feel full after eating.
Food goes into the stomach.
The stomach fills with food.
The stomach stretches slowly.
Stretching sends signals.
The signals go to the brain.
The brain knows we at...
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47
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W-67 How Do We Breathe While Sleeping?
We breathe all the time.
We breathe even when we sleep.
Sleep makes the body rest.
Breathing does not stop.
Air goes into the nose.
Air moves to the lungs.
The lungs take oxygen.
Oxygen goes in...
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48
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W-62 Why Do We Need Rest?
People need rest every day.
The body works all day.
Working uses energy.
Energy can run low.
The body feels tired.
The brain feels tired too.
Rest means slowing down.
Muscles relax during rest....
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49
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W-68 How Does Food Give Energy?
Food gives energy to the body.
We eat food every day.
Food goes into the stomach.
The body breaks food down.
This is called digestion.
Digestion makes nutrients.
Nutrients go into the blood.
Bl...
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