Exploring the Digestive System

What is the first organ food enters after being swallowed?

• Stomach

• Small intestine

• Esophagus

• Large intestine

What is the name of the enzyme found in saliva that begins the digestion of carbohydrates?

• Pepsin

• Amylase

• Lipase

• Trypsin

Which organ produces bile to help digest fats?

• Pancreas

• Stomach

• Liver

• Gallbladder

What is the term for the wave-like muscle contractions that move food through the digestive tract?

• Digestion

• Absorption

• Peristalsis

• Secretion

Where does most of the absorption of nutrients take place in the digestive system?

• Stomach

• Large intestine

• Esophagus

• Small intestine

A student eats a meal that contains bread, meat, and butter. Which part of the digestive system would be most responsible for breaking down the fats found in the butter, and what substance helps in this process?

• The stomach, using pepsin to break down fats

• The small intestine, using bile from the liver to emulsify fats

• The large intestine, using water to dissolve fats

• The mouth, using amylase to break down fats

The small intestine is lined with tiny finger-like projections called villi. How does the presence of villi help the digestive system function more effectively?

• They produce stomach acid to break down food

• They increase the surface area available for nutrient absorption

• They store excess nutrients for later use

• They filter waste materials from digested food

A person has a condition where their stomach does not produce enough acid. Which of the following would most likely be affected as a result?

• The absorption of water in the large intestine

• The movement of food through the esophagus

• The breakdown of proteins in the stomach

• The production of bile in the liver

If the large intestine were not functioning properly and could not absorb water from digested material, what would most likely happen to a person?

• They would be unable to produce saliva

• They would experience dehydration and loose stools

• They would stop producing digestive enzymes

• They would be unable to swallow food

A student compares the digestive system to a food processing factory. In this comparison, which organ best represents the "sorting and packaging department" where nutrients are sent into the bloodstream, and why?

• The stomach, because it mixes and churns food into a liquid form

• The esophagus, because it transports food from one place to another

• The small intestine, because it absorbs nutrients and sends them into the bloodstream

• The large intestine, because it removes all waste from the body