Chapter 9 - The Digestive System - REVISION Flashcards Preview

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Flashcards in Chapter 9 - The Digestive System - REVISION Deck (50)
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1

What is digestion?

Digestion is the breakdown of food into components which can be used within the body.

2

What two ways does digestion occur in?

Digestion occurs in two ways: mechanical and chemical.

3

What is mechanical digestion?

Mechanical digestion is the physical breakdown of food into smaller pieces.

4

What is chemical digestion?

Chemical digestion is the chemical breakdown of food by substances known as enzymes.

5

What part of the body does chemical and mechanical digestion first occur?

The mouth.

6

What is the first stage of the digestive process?

Ingestion

7

What is ingestion

Ingestion is the intake of food into the mouth where it is chewed and swallowed.

8

Where does the initial stages of digestion take place? with the aid of what?

The mouth, with the aid of the teeth, tongue and salivary glands.

9

What stage of the digestive process does mechanical and chemical digestion take place first?

Ingestion.

10

Where does mechanical digestion begin?

Mechanical digestion begins with the teeth.

11

What are teeth used for in the first stages of what?

Teeth are used in the first stages of digestion to break up food into smaller pieces by tearing, crushing and grinding it.

12

What are the four types of tooth?

Incisor, Canine, Premolar and Molar.

13

What is related to the diet of the animal?

The number and type of teeth present in an animal's mouth is related to the diet of the animal.

14

Define Incisors

Chisel-like teeth used for cutting and biting.

15

Define Canines

Pointed and sharp teeth used for tearing food.

16

Define Premolar

Relatively flat teeth used for grinding.

17

Define Molar

Flat teeth used for crushing food.

18

Be able to draw the LS of a tooth (pg 109)

Read

19

What do Herbivores eat?

Herbivores eat plant materials only.

20

What do herbivores use their molars and premolars for?

Crushing and grinding material such as grass.

21

Name 3 Herbivores

Cattle, Sheep and Horses.

22

What do Carnivores eat?

Carnivores eat meat.

23

What do carnivores use for tearing what?

Carnivores use their canine teeth for tearing flesh.

24

What do Omnivores eat? Give an example of an omnivore.

Omnivores eat both plant material and meat. Pigs are an example of an omnivore.

25

_____ do not have a specialised _____ but use all the types of _____ listed to aid _____ of a variety of foods.

Omnivores do not have a specialised dentition but use all the types of teeth listed to aid digestion of a variety of foods.

26

What is the dental formula of a pig?

I:3/3 C:1/1 P:4/4 M:3/3

27

How many teeth does a pig have?

44 teeth.

28

How many teeth does a pig have on its upper jaw?

22 teeth.

29

How many teeth does a pig have on its lower jaw?

22 teeth.

30

What is the dental formula of a herbivore (cow, sheep or goat)

I:0/3 C:0/1 P:3/3 M3/3