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Starter Q1. Mammals need food for energy. Give two other reasons why food is needed.

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Starter Q1. Mammals need food for energy. Give two other reasons why food is needed. Q2. Explain why having a bowl of cereal in the morning is better than having a can of energy drink. Q3. Explain why eating lots of vegetables is very important to prevent constipation. Why Nutrients are needed

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Presentation Transcript
slide1

Starter

Q1. Mammals need food for energy. Give two other reasons why food is needed.

Q2. Explain why having a bowl of cereal in the morning is better than having a can of energy drink.

Q3. Explain why eating lots of vegetables is very important to prevent constipation.

slide2

Why Nutrients are needed

  • Mammals are made up of many cells and those cells need nutrients for:
  • Energy– for all the chemical reactions which take place in the cells
  • Growth– make more cells
  • Repair– replace damaged cells
slide3

On your exercise book:

  • Write down seven foods containing high amounts of carbohydrates
  • Write down five foods containing high amounts of lipids
  • Write down five foods containing high amounts of proteins
slide4

The three classes of foodthat mammals consume to obtain nutrients are:

  • Carbohydrates
  • Lipids
  • Proteins
slide5

Carbohydrates

  • Carbohydrates are starch and cellulose.
  • Starch is a very very long molecule, made of many tiny units called glucose molecules. Glucose is commonly known as sugar.
  • Cellulose is also a very long molecule made of glucose molecules but it cannot be digested!
slide12

Arrange these foods in order of increasing amount of energy.

  • A banana
  • A slice of pepperoni pizza
  • A large cookie (Cookie Time)
  • A cup of milk
  • A slice of bread
  • A BigMac burger from McDonalds
  • A scoop of chips from Fish n’ Chips
slide13

Circle five foods on the list that have the highest amount of energy.

Circle (in a different colour) five foods on the list that have the lowest amount of energy.

slide14

Lipids

Lipids are fats and oils, made up of glycerol and fatty acids.

Lipids have three times more energy than carbohydrates, but are much harder to break down.

slide18

Proteins

Protein molecules are made up of many amino acids.

Proteins contain little amount of energy but they are needed for growth and repairing of the body, as they are the building blocks of cells.

slide21

The body also needs…

  • Vitamins & Minerals
  • Water
slide24

Name: Beriberi

Symtoms

Stomach troubles

Muscle paralysis

Death

Cause

Lack of Vitamin D

slide25

Name: Scurvy

Symtoms

The gums and nose bleed

Internal bleeding may also occur

Cause

Lack of Vitamin C

slide26

Name: Rickets

Symtoms

Bones become very soft and bent

Cause

Lack of Vitamin D

Lack of Calcium

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