Chapter 3

Question 1

Mouth

Answer 1

Physical digestion by teeth

Chemical digestion by enzymes in saliva

Question 2

Oesophagus

Answer 2

A tube that carries food from mouth to stomach by muscular contractions called ‘peristalsis’

Question 3

Stomach

Answer 3

A muscular sac lined with mucous. Food is mixed with stomach acid (hydrochloric acid) and digestive enzymes

Question 4

Liver

Answer 4

Large organ that produces a green liquid called bile that neutralises stomach acid to help break down food

Question 5

Pancreas

Answer 5

A small sac below the liver. It stores and releases bile into the small intestine

Question 6

Bile duct

Answer 6

Tube like structure which carries the bile from the gall bladder to the duodenum

Question 7

Small intestine

Answer 7

Long thin tube that food moves through after the stomach. Digested food is absorbed from the small intestine bloodstream. More enzymes are produced here to breakdown food further. The blood then transports the nutrients to all body cells

Question 8

Large intestine

Answer 8

Water is reabsorbed back into the bloodstream from undigested food. Passes undigested food to the rectum.

Question 9

Duodenum

Answer 9

The first part of the small intestine. Receives food from the stomach, absorption starts here.

Question 10

Rectum

Answer 10

The lower part of the large intestine, where the undigested food called faeces (poo) is stored before it leaves the body

Question 11

Anus

Answer 11

The muscular opening at the end of the digestive system from which faeces (poo) leaves the body