LC 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

Which statement is NOT true about proteins?

• Protein digestion begins in the mouth.

• Proteins are used for cell growth and repair.

• Proteins are broken down to form amino acids.

• Some complex proteins function as enzymes in the body.

Where is the digestion of food completed?

• liver

• large intestine

• stomach

• 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

Where does protein digestion begins?

• large intestine

• mouth

• small intestine

• stomach

Name the enzyme that acts on starch.

Which of the following is a physical digestion?

• Bile emulsifies fats into smaller fat droplets.

• Glucose formed by maltase in the small intestine.

• Protease breaks down the proteins.

• Salivary amylase mixes with starch in the mouth.

Proteins are broken down into _______.

• Fatty acids

• Glycerol

• Glucose

• Amino acids

The structure that keeps food from entering the trachea is called the _____________.

• Salivary gland

• Epiglottis

• Pharynx

• Esophagus

The main function of the stomach is to:

• Store food

• Produce hydrochloric acid

• Begin protein digestion

• All the above