2.2.2

Healthy Bones

Test yourself on Healthy Bones

Test your knowledge with free interactive questions on Seneca — used by over 10 million students.

Healthy Bones

A good diet is necessary for healthy bones.

What's needed for healthy bones?

What's needed for healthy bones?

Two important nutrients needed for strong bones:
- Calcium.
- Vitamin D.

Sources of calcium

Sources of calcium

Good sources of calcium are:
- Dairy.
- Green vegetables.
- Soya.
- Nuts.
Some bread has added calcium.

Sources of vitamin D

Sources of vitamin D

Vitamin D is made by our bodies from sunlight on our skin.
People who do not get much sunlight or who have dark skin may not make enough vitamin D.

Vitamin D

Vitamin D is made by our bodies from sunlight on our skin. People who do not get much sunlight or who have dark skin may not make enough vitamin D.

Too little vitamin D

Too little vitamin D

Too little vitamin D can cause bones to not grow hard enough.
A disease caused by a lack of vitamin D is rickets.

Rickets

Rickets happens when the bones do NOT grow properly.
Rickets can cause limbs to look bent.
Rickets was a common disease in Victorian times.

Staying healthy

Staying healthy

Children need some sunlight for vitamin D.
- Children must also be careful not to burn or damage their skin.

Sources of vitamin D

Sources of vitamin D

Oily fish like sardines and mackerel.
Red meat like beef and lamb.
Eggs.
Some buttery spreads are fortified (added) with vitamin D.
Some cereals are fortified (added) with vitamin D.
Some people take vitamin D pills.
- Never take any pills without talking to a doctor.

1

Year 3: Plants

1.1

Types of Plants

1.1.1Flowering & Non-flowering Plants

1.2

Parts of a Plant

1.2.1Roots 1.2.2What do Roots do?1.2.3Stem 1.2.4Leaves 1.2.5How Leaves Make Food 1.2.6Flowers

1.3

Pollination

1.3.1Pollination 1.3.2Pollination by Insects 1.3.3Pollination by the Wind

1.4

Seeds

1.4.1Types of Seeds 1.4.2Dispersing Seeds

2

Year 3: Animals (Including Humans)

2.1

Food

2.1.1The Need for Food 2.1.2Food Groups 2.1.3Carbohydrates 2.1.4Proteins 2.1.5Dairy 2.1.6Fruit & Vegetables 2.1.7Fats 2.1.8Junk Food

2.2

Skeletons & Muscles

2.2.1Skeletons & Muscles 2.2.2Healthy Bones

3

Year 3: Rocks

3.1

Rocks on Earth

3.1.1Rocks 3.1.2Fossils

4

Year 3: Light

4.1

What is Light?

4.1.1Light as Energy 4.1.2Reflections 4.1.3Sunlight 4.1.4Shadows

5

Year 3: Forces & Magnets

5.1

Forces

5.1.1What is a Force?5.1.2Contact & Non-Contact Forces 5.1.3Testing Magnetic Materials 5.1.4Attracting & Repelling Magnets 5.1.5Uses of Magnets

6

Year 4: Living Things & Their Habitats

6.1

Grouping Animals

6.1.1Biodiversity & Classification 6.1.2Grouping Animals

6.2

Vertebrates

6.2.1Vertebrates 6.2.2Mammals 6.2.3Reptiles 6.2.4Fish 6.2.5Amphibians 6.2.6Birds

6.3

Invertebrates

6.3.1Invertebrates 6.3.2Insects 6.3.3Spiders 6.3.4Slugs & Snails 6.3.5Worms

6.4

Grouping Plants

6.4.1Grouping Plants 6.4.2Flowering Plants 6.4.3Non-Flowering Plants

6.5

Classification Keys

6.5.1Classification Keys

6.6

Environmental Change

6.6.1Positive Impact of Humans on the Environment 6.6.2Negative Impact of Humans: Deforestation 6.6.3Negative Impact of Humans: Litter 6.6.4Negative Impact of Humans: Overpopulation

7

Year 4: Animals, Including Humans

7.1

Teeth

7.1.1Why Do We Need Teeth?7.1.2'Baby' Teeth 7.1.3Adult Teeth 7.1.4Incisors 7.1.5Canines 7.1.6Premolars 7.1.7Molars

7.2

Digestion

7.2.1What is Digestion?7.2.2The Digestive System - The Mouth 7.2.3The Digestive System - The Stomach 7.2.4The Digestive System - The Small Intestines 7.2.5The Digestive System - The Large Intestines

7.3

Food Chains

7.3.1What are Food Chains?7.3.2Producers, Predators & Prey 7.3.3Herbivores & Carnivores

8

Year 4: States of Matter

8.1

The 3 States of Matter

8.1.1States of Matter 8.1.2Changes of State

8.2

The Water Cycle

8.2.1The Water Cycle 8.2.2Evaporation at Different Temperatures

9

Year 4: Sound

9.1

How Do I Hear?

9.1.1What is Sound?9.1.2Sound Travels to Your Ear

9.2

Pitch

9.3

Volume

9.3.1Volume 9.3.2How Distance Affect Volume

10

Year 4: Electricity

10.1

Uses of Electricity

10.1.1What Uses Electricity?

10.2

Conductors & Insulators

10.2.1Electrical Conductors 10.2.2Electrical Insulators

10.3

Making Circuits

10.3.1What is a Circuit?10.3.2Complete Circuits 10.3.3Electrical Safety

Jump to other topics

1

Year 3: Plants

1.1

Types of Plants

1.1.1Flowering & Non-flowering Plants

1.2

Parts of a Plant

1.2.1Roots 1.2.2What do Roots do?1.2.3Stem 1.2.4Leaves 1.2.5How Leaves Make Food 1.2.6Flowers

1.3

Pollination

1.3.1Pollination 1.3.2Pollination by Insects 1.3.3Pollination by the Wind

1.4

Seeds

1.4.1Types of Seeds 1.4.2Dispersing Seeds

2

Year 3: Animals (Including Humans)

2.1

Food

2.1.1The Need for Food 2.1.2Food Groups 2.1.3Carbohydrates 2.1.4Proteins 2.1.5Dairy 2.1.6Fruit & Vegetables 2.1.7Fats 2.1.8Junk Food

2.2

Skeletons & Muscles

2.2.1Skeletons & Muscles 2.2.2Healthy Bones

3

Year 3: Rocks

3.1

Rocks on Earth

3.1.1Rocks 3.1.2Fossils

4

Year 3: Light

4.1

What is Light?

4.1.1Light as Energy 4.1.2Reflections 4.1.3Sunlight 4.1.4Shadows

5

Year 3: Forces & Magnets

5.1

Forces

5.1.1What is a Force?5.1.2Contact & Non-Contact Forces 5.1.3Testing Magnetic Materials 5.1.4Attracting & Repelling Magnets 5.1.5Uses of Magnets

6

Year 4: Living Things & Their Habitats

6.1

Grouping Animals

6.1.1Biodiversity & Classification 6.1.2Grouping Animals

6.2

Vertebrates

6.2.1Vertebrates 6.2.2Mammals 6.2.3Reptiles 6.2.4Fish 6.2.5Amphibians 6.2.6Birds

6.3

Invertebrates

6.3.1Invertebrates 6.3.2Insects 6.3.3Spiders 6.3.4Slugs & Snails 6.3.5Worms

6.4

Grouping Plants

6.4.1Grouping Plants 6.4.2Flowering Plants 6.4.3Non-Flowering Plants

6.5

Classification Keys

6.5.1Classification Keys

6.6

Environmental Change

6.6.1Positive Impact of Humans on the Environment 6.6.2Negative Impact of Humans: Deforestation 6.6.3Negative Impact of Humans: Litter 6.6.4Negative Impact of Humans: Overpopulation

7

Year 4: Animals, Including Humans

7.1

Teeth

7.1.1Why Do We Need Teeth?7.1.2'Baby' Teeth 7.1.3Adult Teeth 7.1.4Incisors 7.1.5Canines 7.1.6Premolars 7.1.7Molars

7.2

Digestion

7.2.1What is Digestion?7.2.2The Digestive System - The Mouth 7.2.3The Digestive System - The Stomach 7.2.4The Digestive System - The Small Intestines 7.2.5The Digestive System - The Large Intestines

7.3

Food Chains

7.3.1What are Food Chains?7.3.2Producers, Predators & Prey 7.3.3Herbivores & Carnivores

8

Year 4: States of Matter

8.1

The 3 States of Matter

8.1.1States of Matter 8.1.2Changes of State

8.2

The Water Cycle

8.2.1The Water Cycle 8.2.2Evaporation at Different Temperatures

9

Year 4: Sound

9.1

How Do I Hear?

9.1.1What is Sound?9.1.2Sound Travels to Your Ear

9.2

Pitch

9.3

Volume

9.3.1Volume 9.3.2How Distance Affect Volume

10

Year 4: Electricity

10.1

Uses of Electricity

10.1.1What Uses Electricity?

10.2

Conductors & Insulators

10.2.1Electrical Conductors 10.2.2Electrical Insulators

10.3

Making Circuits

10.3.1What is a Circuit?10.3.2Complete Circuits 10.3.3Electrical Safety

Practice questions on Healthy Bones

Can you answer these? Test yourself with free interactive practice on Seneca — used by over 10 million students.

1
How do our bodies make vitamin D?Multiple choice
2
What is the disease caused by a lack of vitamin D?Multiple choice

Answer all questions on Healthy Bones

Unlock your full potential with Seneca Premium

Unlimited access to 10,000+ open-ended exam questions
Mini-mock exams based on your study history
Unlock 800+ premium courses & e-books

Get started with Seneca Premium

Skeletons & Muscles

Rocks