What Happens To Food

Ingestion

•  When you put food in your mouth
• Chewing food is called mastication
• The Salivary Glands releases saliva into the mouth to lubricate and then you swallow and it goes down your oesophagus

JOHN KEY!!

• The food is 'pushed' down the oesophagus to the stomach by waves of muscle contractions. This process is called Peristalsis

Peristalsis

Digestion - The Stomach

• The Stomach Can Hold 2 - 4 litres of fluid and is able to expand and take more food to protect us from scavengers
• The Stomach holds very dangerous acids and can hurt you if you throw up too much
• The pH of the acids are around 1 - 2

Digestion - The Small Intestine

• The pH in the small intestine is usually 7 - 9
• The walls are lined with small finger-like projections called villi which increase the surface area of the small intestine
• These villi are covered in microvilli which again increase the surface area of the small intestine
• With a larger surface area, the food nutrients can be absorbed quicker

*Stomach Noise intensifies*

Digestion - The Liver

• The liver is the second largest organ in the human body after the skin
• After they are digested, the nutrients are absorbed and transported to the liver via the Hepatic Portal Vein
• The liver creates bile which is then stored in the gall bladder

Absorption

Egestion