Science: Digestion - ch.3.1

Question 1

Chemical Digestion + e.g.

Answer 1

• Complex substances are broken down into simple chemicals that the body can now absorb
• Chemical change

Question 2

Mechanical Digestion + e.g.

Answer 2

• Food is broken down into smaller pieces by your teeth
• Physical change

Question 3

Digestion

Answer 3

The process of breaking down food into usable nutrients.

Question 4

Bolus

Answer 4

The tongue rolls food into a ball

Question 5

Saliva

Answer 5

Moistens food, making slippery, slimy and easy to swallow

Question 6

Epiglottis

Answer 6

Flap preventing food from entering the trachea.

Question 7

Oesophagus (food pipe)

Answer 7

Muscular tube transporting food from mouth to stomach.

Question 8

Peristalsis

Answer 8

Muscles contract and relax behind the bolus pushing the food down the tube

Question 9

Stomach

Answer 9

Churns food and mixes it with gastric juice.

Question 10

Gastric Juice

Answer 10

Digestive fluid containing hydrochloric acid, mucus & digestive juices

Question 11

Digestive Juices

Answer 11

starts the digestion of protein

Question 12

Hydrochloric Acid

Answer 12

Strong acid that kills bacteria in food.

Question 13

Mucus

Answer 13

Protective layer preventing stomach to digest itself

Question 14

Duodenum

Answer 14

• first part of the small intestine
• Carries important chemicals for digestion

Question 15

Pancreas

Answer 15

Not part of the digestive tract
- Produces pancreatic juice that help digest fat, protein and carbohydrates
- regulates blood glucose levels

Question 16

Liver

Answer 16

Removes toxins and processes nutrients from blood.

Question 17

Villi

Answer 17

• Increases surface area of the intestinal wall
• Allows nutrients to be absorbed

Question 18

Large Intestine

Answer 18

• Water and remaining nutrients are reabsorbed
• faeces (poo) is formed