Physical Physical Digestion: The Role of Teeth and Other Digestive Processes

The video tutorial explains the role of teeth in digestion, focusing on physical digestion, which breaks down food into smaller pieces without chemical changes. It covers the structure of a tooth, including enamel, dentine, and pulp, and describes the functions of different types of teeth: incisors, canines, premolars, and molars. The video also discusses the stomach's role in digestion, highlighting the churning process and the role of stomach acid. Additionally, it explains how bile from the gallbladder aids digestion by neutralizing stomach acid and emulsifying fats. The tutorial concludes with a summary of physical digestion.

What is the primary purpose of physical digestion?

• To chemically alter food molecules

• To increase the surface area of food for enzyme action

• To absorb nutrients directly into the bloodstream

• To eliminate waste from the body

Which part of the tooth is known for its hardness and resistance to wear?

• Cement

• Enamel

• Pulp

• Dentine

What is the main function of canines in the mouth?

• Mixing food with saliva

• Tearing and holding food

• Grinding food

• Biting and cutting

How does the stomach contribute to physical digestion?

• By absorbing nutrients

• By churning food to break it into smaller pieces

• By producing bile

• By neutralizing stomach acid

What is one of the roles of bile in digestion?

• To chemically digest proteins

• To emulsify fats and oils

• To produce digestive enzymes

• To absorb carbohydrates