7.3 Digestion

Question 1

enamel

Answer 1

the very strong material that covers the surface of a root

Question 2

dentine

Answer 2

a living tissue that lies just beneath the enamel of a tooth

Question 3

incisors

Answer 3

chisel-shaped teeth at the front of the mouth, used for biting off pieces of food

Question 4

cement

Answer 4

the material that holds a tooth in the gum

Question 5

canines

Answer 5

pointed teeth at either side of the incisors, used in a similar way to incisors in carnivores,they are used to kill prey

Question 6

premolars

Answer 6

Teeth with broad, ridged surfaces found between the canines and molars; they are used for grinding food to increase its surface area

Question 7

molars

Answer 7

teeth similar to premolars but usually larger,with broad, ridged surfaces, found towards the back of the mouth; they are used for grinding food to increase its surface area

Question 8

maltose

Answer 8

a reducing sugar made of two glucose molecules joined together

Question 9

epithelium

Answer 9

a tissue that covers a surface in an animal; for example, an epithelium covers the inside of the wall of the human alimentary canal

Question 10

pepsin

Answer 10

a protease enzyme secreted in gastric juice; it has an optimum pH of 2

Question 11

gastric juice

Answer 11

a liquid secreted by the walls of the stomach it contains pepsin and hydrochloric acid

Question 12

trypsin

Answer 12

a protease enzyme secreted by the pancreas; it works in the duodenum

Question 13

emulsifies

Answer 13

breaks down large drops of fat or oil into smaller droplets, increasing their surface area and allowing them to mix with watery liquids