Digestive System Functions and Processes

The video explains the process of digestion, starting with mechanical and chemical digestion in the mouth, where food is chewed and mixed with saliva containing amylase. The epiglottis directs food to the esophagus, a muscular tube that uses peristaltic action to move food to the stomach. The stomach stores, mixes, and breaks down food into a mash, which is then slowly released into the small intestine. The small intestine is where most nutrient absorption occurs, completing the digestive process.

What enzyme in saliva begins the breakdown of carbohydrates?

• Lactase

• Protease

• Amylase

• Lipase

What is the role of the epiglottis in digestion?

• To absorb nutrients

• To produce saliva

• To break down food

• To direct air to the lungs and food to the esophagus

How does the esophagus move food to the stomach?

• By gravity

• By peristaltic action

• By enzymatic action

• By chemical digestion

What is the primary function of the rugae in the stomach?

• To absorb nutrients

• To allow the stomach to stretch and grip food

• To store food

• To produce digestive juices

Which part of the stomach is responsible for mixing food with digestive juices?

• Upper part

• Entire stomach

• Middle part

• Lower part

What is the final task of the stomach before food enters the small intestine?

• To produce enzymes

• To absorb nutrients

• To empty the acidic mash into the small intestine

• To store food

Where does most nutrient absorption occur in the digestive system?

• Stomach

• Mouth

• Large intestine

• Small intestine

What is the first part of the small intestine called?

• Cecum

• Jejunum

• Duodenum

• Ileum