Digestive System and Energy from Food

What are the two main reasons we eat food?

• Flavor and habit

• Energy and raw materials

• Hunger and taste

• Social and cultural reasons

What does a calorie measure in food?

• Nutritional value

• Energy content

• Volume

• Weight

What are the two main types of digestion?

• Organic and inorganic

• Internal and external

• Solid and liquid

• Mechanical and chemical

What role do enzymes play in digestion?

• Add flavor to food

• Increase food mass

• Break down large molecules

• Absorb nutrients

Which nutrient type is primarily broken down in the mouth?

• Nucleic acids

• Proteins

• Fats

• Carbohydrates

What is the primary function of saliva in digestion?

• Lubricate food

• Enhance food flavor

• Cool down hot food

• Begin chemical digestion

Which type of molecule contains the most calories per gram?

• Proteins

• Carbohydrates

• Nucleic acids

• Fats

What is the primary function of the stomach in digestion?

• Absorb nutrients

• Mechanical breakdown of food

• Secrete enzymes

• Store undigested food

Tags

NGSS.MS-LS1-7

Which organ is not part of the alimentary canal?

• Esophagus

• Stomach

• Small intestine

• Liver

Tags

NGSS.MS-LS1-7

What is the main purpose of peristalsis?

• Break down food chemically

• Secrete digestive juices

• Absorb nutrients

• Move food through the digestive tract