Biology - Human Body Systems - Digestive system - Digestion Step by Step
7-step journey. Step 1: 'MOUTH - Mechanical digestion: teeth chew food into small pieces. Chemical digestion: saliva enzyme (amylase) breaks down starch into sugar.' Step 2: 'ESOPHAGUS - A muscular tube that pushes food down by squeezing (peristalsis). Works even if you're upside down!' Step 3: 'STO