The Digestive system-the life of a sandwhich (great way of remebering digestion!)

The life of a ham sandwhich:

MOUTH

• the sandwhich (which is called hamlet) enters the mouth

salivary glands produce saliva which contains lots of the digestive enzyme amylase.(fact: dog saliva is antiseptic)

• Teeth break down hamlet (in the mouth mechanical and chemical digestion occurs, mechanical: the teeth breaking down the food, chemical: the enzyme amylase is produced)

OESOPHAGUS:

• next Hamlet moves down the oesophagus (this is a muscular tube that connects the mouth to the stomach)

Hamlet (who is now a bolus (a ball of food)) moves down the oesophagus by peristalsis (circlular muscles outside the oesophagus contract and relax)

STOMACH:

• Mechanical and chemical digestion occurs again: Mechanical: Walls of stomach are pummaling hamlet, Chemical: Another enzyme: pepsin (a protease) is produced.
• hydrochloric acid is also produced here, it is the optimum PH (ph 2) for protease it work

hydrochloric acid also kils bacteria

LIVER:

• Food doesn’t pass through the liver but it…