Digestive System

What type of digestion is occurring in the mouth?

• chemical digestion

• mechanical digestion

• both chemical and mechanical digestion

• neither chemical nor mechanical digestion

Answer explanation

In the mouth, both chemical and mechanical digestion occur. Chemical digestion involves enzymes breaking down food molecules, while mechanical digestion involves physical breakdown of food through chewing and mixing with saliva.

Chewing food is considered what type of digestion?

• chemical

• mechanical

• both

• neither

Answer explanation

Chewing food is considered mechanical digestion because it involves the physical breakdown of food into smaller pieces without changing its chemical composition.

Saliva is considered what type of digestion?

• chemical

• mechanical

• both

• neither

Answer explanation

Saliva is considered chemical digestion because it contains enzymes that break down food molecules.

Stomach acid is what type of digestion?

• chemical

• mechanical

• both

• neither

Answer explanation

Stomach acid is a form of chemical digestion, breaking down food molecules into smaller components through the use of acids and enzymes.

The stomach churning is what type of digestion?

• chemical

• mechanical

• both

• neither

Answer explanation

The stomach churning is a mechanical digestion process, involving the physical breakdown of food into smaller pieces without changing its chemical composition.

What tiny structures help with the digestion of nutrients in the small intestine?

• gallbladders

• membranes

• vessels

• villi

Answer explanation

Villi are the tiny structures that help with the digestion of nutrients in the small intestine.

What organ is responsible for the absorption of nutrients?

• esophagus

• stomach

• small intestine

• large intestine

Answer explanation

The small intestine is responsible for the absorption of nutrients from the digested food.

What organ is responsible for the absorption of water?

• esophagus

• stomach

• small intestine

• large intestine

Answer explanation

The large intestine is responsible for the absorption of water from the digestive system.

List the digestive tract in order from start to finish.

• mouth, stomach, esophagus, small intestine, large intestine

• mouth, esophagus, stomach, large intestine, small intestine

• mouth, esophagus, stomach, small intestine, large intestine

• mouth, esophagus, small intestine, stomach, large intestine

Answer explanation

The correct order of the digestive tract is mouth, esophagus, stomach, small intestine, large intestine.

The chemical in saliva that helps to break down food. 

• Amylase

• Bile

• Hydrochloric Acid

• Chyme

Answer explanation

The chemical in saliva that helps to break down food is amylase, which aids in the digestion of carbohydrates.