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1 1 KS3 SCIENCE - BIOLOGY KS3 SCIENCE - BIOLOGY Diet & Digestion Diet & Digestion

NUTRITION 2 2

3 3 Nutrition is the taking of food by organisms Nutrition is the taking of food by organisms FOODWASTE ANIMAL

WASTEFOOD NUTRITION 4 4 This is used for growth, energy and other processes This is used for growth, energy and other processes GROWTH&ENERGY

TYPES OF NUTRIENT 5 5

6 6 There are seven main nutrient groups, and you need all of them for a healthy, balanced diet There are seven main nutrient groups, and you need all of them for a healthy, balanced diet HUMAN

Water TYPES OF NUTRIENT 7 7 There are seven main nutrient groups, and you need all of them for a healthy, balanced diet There are seven main nutrient groups, and you need all of them for a healthy, balanced diet Carbo- hydrate Protein FatVitamins MineralsFibre HUMAN

Water TYPES OF NUTRIENT 8 8 Carbohydrate is a fuel - it provides energy for activity Carbohydrate is a fuel - it provides energy for activity Carbo- hydrate Protein FatVitamins MineralsFibre HUMAN

Water TYPES OF NUTRIENT 9 9 Protein is a building block used for growth and repair Protein is a building block used for growth and repair Carbo- hydrate Protein FatVitamins MineralsFibre HUMAN

Water TYPES OF NUTRIENT 10 Fat is a way of storing energy and keeping warm Fat is a way of storing energy and keeping warm Carbo- hydrate Protein FatVitamins MineralsFibre HUMAN

Water TYPES OF NUTRIENT 11 Vitamins in tiny amounts are used to make bones hard and skin supple Vitamins in tiny amounts are used to make bones hard and skin supple Carbo- hydrate Protein FatVitamins MineralsFibre HUMAN

Water TYPES OF NUTRIENT 12 Minerals are needed in small amounts e.g. for blood (iron) or bones (calcium) Minerals are needed in small amounts e.g. for blood (iron) or bones (calcium) Carbo- hydrate Protein FatVitamins MineralsFibre HUMAN

Water TYPES OF NUTRIENT 13 Fibre or Roughage is not digested, but helps food move through you Fibre or Roughage is not digested, but helps food move through you Carbo- hydrate Protein FatVitamins MineralsFibre HUMAN

Water TYPES OF NUTRIENT 14 Water makes up 70% of your body and is needed for chemical reactions Water makes up 70% of your body and is needed for chemical reactions Carbo- hydrate Protein FatVitamins MineralsFibre HUMAN

DIGESTION 15

DIGESTION 16 Food is first chewed to physically break it up, and Saliva contains something called an Enzyme which starts to break down the food chemically Food is first chewed to physically break it up, and Saliva contains something called an Enzyme which starts to break down the food chemically

DIGESTION 17 The Gullet or Oesophagus carries the food down by contracting itself - this is called Peristalsis The Gullet or Oesophagus carries the food down by contracting itself - this is called Peristalsis

DIGESTION 18 In the Stomach, food is churned to break it up, broken down chemically by more enzymes, and treated with hydrochloric acid to kill bacteria In the Stomach, food is churned to break it up, broken down chemically by more enzymes, and treated with hydrochloric acid to kill bacteria

DIGESTION 19 In the Duodenum, Bile is injected from the Liver to neutralise stomach acid and emulsify fats, while the Pancreas injects more enzymes In the Duodenum, Bile is injected from the Liver to neutralise stomach acid and emulsify fats, while the Pancreas injects more enzymes Liver & Pancreas Liver & Pancreas

DIGESTION 20 In the Small Intestine more enzymes are produced and the broken down food is absorbed into the blood In the Small Intestine more enzymes are produced and the broken down food is absorbed into the blood

DIGESTION 21 The walls of the small intestine have millions of Villi, which create a large surface area and thin walls allowing nutrients to be absorbed The walls of the small intestine have millions of Villi, which create a large surface area and thin walls allowing nutrients to be absorbed

DIGESTION 22 In the Large Intestine excess water and salts are removed, and the remains are stored as Faeces in the Rectum before being Egested In the Large Intestine excess water and salts are removed, and the remains are stored as Faeces in the Rectum before being Egested