Which of the following is NOT part of mechanical digestion?

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Multiple Choice

Which of the following is NOT part of mechanical digestion?

Explanation:
Mechanical digestion is about physically breaking down food and moving it through the digestive tract without changing its chemical structure. Chewing breaks food into smaller pieces, the tongue helps manipulate and mix it into a swallowable bolus, and peristaltic contractions move and churn contents along the digestive tract. In contrast, chemical digestion uses enzymes and acids to alter chemical bonds, turning large molecules into smaller, different molecules. Because this changes the chemical composition of the food, it is not part of mechanical digestion.

Mechanical digestion is about physically breaking down food and moving it through the digestive tract without changing its chemical structure. Chewing breaks food into smaller pieces, the tongue helps manipulate and mix it into a swallowable bolus, and peristaltic contractions move and churn contents along the digestive tract. In contrast, chemical digestion uses enzymes and acids to alter chemical bonds, turning large molecules into smaller, different molecules. Because this changes the chemical composition of the food, it is not part of mechanical digestion.

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