• Ingestion (Mouth and Esophagus)
    • Taking in food by the mouth (also known as the oral/buccal cavity)
      • First step of digestion
    • Breakdown of food
      • Chewing (mechanical breakdown)
      • Salivary Amylase and Lipase (chemical breakdown)
      • Lubrication (saliva)
    • Broken down food (called a bolus) moved into esophagus by swallowing
      • Food moved along by smooth muscle contractions (peristalsis)
        • The wave-like propulsion of food through contractions in GI tract
      • Sphincter muscles at top and bottom of esophagus control movement of food