Chemical and Physical Changes in Digestion

This video explores the physical and chemical changes in the digestive system. It explains how digestion begins in the mouth with both mechanical and chemical processes, continues through the esophagus, and intensifies in the stomach where most digestion occurs. The small intestines absorb nutrients, while the large intestines focus on water absorption and waste preparation. Key concepts include the roles of enzymes, peristalsis, and the importance of breaking down food into absorbable molecules.

What is the main difference between a physical change and a chemical change?

• A chemical change only changes the appearance.

• A physical change creates a new substance.

• A chemical change does not alter the substance.

• A physical change alters the substance but it remains the same.

Which of the following is an example of a chemical change in the digestive system?

• Grinding an apple into applesauce

• Chewing bread into smaller pieces

• Saliva turning bread into sugar

• Swallowing food down the esophagus

Tags

NGSS.MS-PS1-2

What role do the teeth and tongue play in digestion?

• They grind and mash food into smaller pieces.

• They chemically break down food.

• They produce enzymes for digestion.

• They absorb nutrients from food.

What is the function of the esophagus in the digestive process?

• It squeezes food down to the stomach.

• It absorbs nutrients into the blood.

• It grinds food into smaller pieces.

• It chemically digests food.

Where does the majority of digestion occur?

• Esophagus

• Mouth

• Stomach

• Large intestines

Which enzyme in the stomach helps break down proteins?

• Lipase

• Maltase

• Pepsin

• Amylase

What is the primary function of the small intestines?

• Producing saliva

• Grinding food into smaller pieces

• Absorbing nutrients into the bloodstream

• Storing food

Why is the small intestine so long?

• To allow more time for nutrient absorption

• To increase mechanical digestion

• To produce more enzymes

• To store more food

What is the main function of the large intestines?

• Absorbing nutrients

• Breaking down proteins

• Absorbing water and collecting waste

• Producing enzymes

What happens to the remaining food in the large intestines?

• It is turned into sugar.

• It is collected and prepared for waste removal.

• It is chemically digested.

• It is absorbed into the bloodstream.

Tags

NGSS.MS-LS1-7