GENERAL HISTOLOGY

Detailed explanation-1: -From the above discussion, it is clear that digestion of food is not a physical change. So, the correct answer is “Option D”.

Detailed explanation-2: -The stomach lining produces strong digestive juices. These create chemical reactions in the stomach, breaking down and dissolving its nutrients.

Detailed explanation-3: -When food is physically changed, mechanical digestion occurs. Food is broken into smaller parts and mixes continually with enzymes and other gastric juices. Mechanical digestion occurs in the mouth, stomach, and small intestine. Food is chemically changed in digestion when new, smaller substances are formed.

Detailed explanation-4: -Mechanical digestion involves physically breaking down food substances into smaller particles to more efficiently undergo chemical digestion. The role of chemical digestion is to further degrade the molecular structure of the ingested compounds by digestive enzymes into a form that is absorbable into the bloodstream.