GCSE Digestion, Teeth, Enzymes and Absorption Bundle | Teaching ... - Free Printable

Let's solve this step-by-step based on the diagram and the instructions provided.

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Part 1: Types of Teeth

Identify the four types of teeth labeled in the diagram (1–4):

From the top view of the mouth:

1. Incisors – These are the front teeth used for cutting food.
2. Canines – The pointed teeth next to incisors, used for tearing food.
3. Premolars – Located behind canines; they help in crushing and grinding food.
4. Molars – The large flat teeth at the back used for grinding and chewing food.

So, fill in the blanks:
- 1. Incisors
- 2. Canines
- 3. Premolars
- 4. Molars

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Describe how the four types of teeth are involved in mastication (chewing):

> Mastication is the process of chewing food using the teeth, tongue, and jaw muscles.

1. Incisors: Cut and slice food into smaller pieces. They act like scissors when biting off pieces of food.
2. Canines: Tear and rip tough foods (like meat) due to their sharp, pointed shape.
3. Premolars: Crush and grind food after it has been cut or torn. They have flat surfaces with ridges for grinding.
4. Molars: Perform the bulk of the grinding and chewing action. Their broad, flat surfaces allow them to crush and pulverize food thoroughly before swallowing.

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Part 2: Structure of a Tooth

Label the parts of the molar tooth shown in the cross-section:

1. Enamel – The hard, white outer layer of the crown (top part of the tooth).
2. Dentine – The layer beneath enamel, making up most of the tooth structure; softer than enamel but still strong.
3. Pulp – The soft inner tissue containing nerves and blood vessels.
4. Cementum – The thin layer covering the root of the tooth.
5. Periodontal membrane (also called periodontal ligament) – Connects the tooth to the alveolar bone; acts as a shock absorber during chewing.
6. Alveolar bone – The bony socket in which the tooth root sits.
7. Crown – The visible part of the tooth above the gum line.
8. Root – The part of the tooth below the gum line that anchors it into the jawbone.

So, fill in the labels:

- 1. Enamel
- 2. Dentine
- 3. Pulp
- 4. Cementum
- 5. Periodontal membrane
- 6. Alveolar bone
- 7. Crown
- 8. Root

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Part 3: Description of Tooth Parts

| Tooth Part | Description |
|----------------------|-----------|
| Enamel | The hardest substance in the body, covering the crown of the tooth. It protects the tooth from wear and acid erosion. |
| Dentine | A calcified tissue beneath the enamel and cementum; forms the bulk of the tooth. It is less hard than enamel but supports the tooth structure and transmits sensation. |
| Pulp | The central soft tissue of the tooth containing nerves, blood vessels, and connective tissue. It nourishes the tooth and responds to injury or infection. |
| Cementum | A bonelike substance covering the root of the tooth. It helps anchor the tooth to the periodontal ligament. |
| Periodontal Membrane | A fibrous connective tissue that attaches the tooth to the alveolar bone. It cushions the tooth during chewing and allows slight movement. |

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✔ Final Answer Summary:

#### Types of Teeth (Labels):
1. Incisors
2. Canines
3. Premolars
4. Molars

#### Role in Mastication:
- Incisors: Cut food.
- Canines: Tear food.
- Premolars: Crush and grind food.
- Molars: Grind and chew food thoroughly.

#### Structure of a Tooth (Labels):
1. Enamel
2. Dentine
3. Pulp
4. Cementum
5. Periodontal membrane
6. Alveolar bone
7. Crown
8. Root

#### Tooth Part Descriptions:
- Enamel: Hardest substance in the body; protects the tooth.
- Dentine: Supports enamel and makes up most of the tooth; sensitive to stimuli.
- Pulp: Contains nerves and blood vessels; vital for tooth health.
- Cementum: Covers the root; helps anchor tooth.
- Periodontal Membrane: Connects tooth to bone; absorbs chewing forces.

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