Chapter 5: Human Digestive System

Which of the following correctly describes the purpose of digestion?

• To break down complex food molecules into simple soluble molecules

• To make complex food molecules from simple soluble molecules

• To make use of simple soluble food molecules

• To remove complex food molecules from the body

What enzyme is produced in the stomach?

• amylase

• lipase

• maltase

• protease

Where is the digestion of food completed?

• liver

• large intestine

• stomach

• small intestine

Which of the following kills bacteria in the human alimentary canal?

• gastric juice

• mucus

• pancreatic juice

• saliva

Where does carbohydrate digestion begins?

• liver

• mouth

• oesophagus

• stomach

Which of the following is physical digestion?

• Bile emulsifies fats into smaller fat droplets.

• Glucose formed by maltase in the small intestine.

• Protease breaks down proteins.

• Salivary amylase mixes with starch in the mouth.

Study the following diagram of the human digestive system.

Which of the labeled organs produce(s) digestive juices for digestion?

• M only

• N only

• M and N

• none of them

Select ALL the enzymes present in the intestinal juice.

• amylase

• lipase

• maltase

• protease

What are the names of the products formed by action of lipase on small fat droplets?

• fatty acids and glycerol
• amino acids and glycerol

• fatty acids and glucagon

• fatty acids and glycogen

Which of the following is not a final product of digestion?

• maltose

• glycerol

• amino acids

• glucose