THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -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.

Detailed explanation-2: -Mechanical processing/digestion is crushing and shearing that makes materials easier to propel along the digestive tract. It also increases their surface area, making them more susceptible to enzymatic attack.

Detailed explanation-3: -Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract.