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

Chewing, grinding, and churning are examples of...

• mechanical digestion
• chemical digestion

Where does carbohydrate digestion begins?

• liver

• mouth

• oesophagus

• stomach

Saliva contains a carbohydrate enzyme called ___.

• Amylase

• Pepsin

• Lipase

• Maltase

The chewed up food moves from the mouth to the stomach through the ___________.

• esophagus

• pancreas

• liver

• small intestine

Why is the oesophagus muscular?

• To break the food into even smaller pieces

• To produce enzymes to digest food

• To push food from the mouth into the stomach

• To move the food back and forth in two directions

What organ is this?

• stomach
• large intestine
• small intestine
• esophagus

Which of the following kills bacteria in the human digestive system?

• Hydrochloric acid

• Mucus

• Amylase

• Pepsin

Where does protein digestion begins?

• large intestine

• mouth

• small intestine

• stomach

Which enzyme does the stomach produce?

• amylase

• lipase

• maltase

• pepsin (protease)