What is mechanical digestion?

What is mechanical digestion?

• A. Chemical digestion
• B. Enzymatic digestion
• C. Absorption
• D. Physical breakdown of large pieces of food into smaller pieces

Answer: (D)

Mechanical digestion is the physical breakdown of large pieces of food into smaller pieces, without changing their chemical composition. This happens when you chew in the mouth and when the stomach churns and mixes food, breaking it into smaller fragments and increasing the surface area for later chemical digestion. The other concepts involve chemical changes (enzymes breaking chemical bonds) or absorption (moving nutrients into the bloodstream), which are not mechanical digestion.

Mechanical digestion is the physical breakdown of large pieces of food into smaller pieces, without changing their chemical composition. This happens when you chew in the mouth and when the stomach churns and mixes food, breaking it into smaller fragments and increasing the surface area for later chemical digestion. The other concepts involve chemical changes (enzymes breaking chemical bonds) or absorption (moving nutrients into the bloodstream), which are not mechanical digestion.