3.2 esssential intake control and coordination

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  • STUDENTS CREATE OWN MIND MAP IN GROUPS
  • 3.2 esssential intake control and coordination

    1. 1. CHAPTER 3 SCIENCE QUEST 9Compiled by: M Nortje Year 9 Science/2012 1
    2. 2. Feeling hungry? Tummy rumbling? You need to eat to provide your body with nutrients.WWW. nutrition.com.sg Compiled by: M Nortje Year 9 Science 2
    3. 3. Why do you have to eat? THE FIVE MAIN GROUPS OF NUTRIENTS. Nutrients are substances needed for energy, cell functioning and for your bodys growth and repair. Compiled by: M Nortje Year 9 Science 3
    4. 4.  Carbohydrates Proteins Lipids Vitamins All CONTAIN CARBON, HYDROGEN AND OXYGENC ,H&O EXCEPT MINERALS Compiled by: M Nortje Year 9 Science 4
    5. 5.  Carbohydrates & lipids →provide immediate source of energy and a back- up supply. Proteins can supply some energy, while their key role → bodybuilding compounds. Carbohydrates& lipids nutrients provide the raw materials required for cell growth and the repair of damaged and worn-out tissues. Compiled by: M Nortje Year 9 Science 5
    6. 6.  Carbohydrates and lipids are also involved in many other activities in your body: Important chemicals such as enzymes and hormones are made of protein. Althoughvitamins have no energy value, they are needed in small amounts to keep you healthy and to speed up a variety of chemical reactions in your body. Compiled by: M Nortje Year 9 Science 6
    7. 7.  Carbohydrates are found in foods like pasta, rice, fruits and vegetables. Carbohydrates are broken down into glucose by the digestive system. Glucoseis used in aerobic and anaerobic respiration as a source of energy. Compiled by: M Nortje Year 9 Science 7
    8. 8.  Lipids (fats and oils) are very-high- energy foods that are only needed in small amounts. Lipids are found in deep-fried foods, dairy foods like butter, cheese and milk, and in meat. Some fast foods and processed foods are high in fat. Compiled by: M Nortje Year 9 Science 8
    9. 9.  Proteinsare found in fish, meat, chicken, eggs, beans, peas, nuts and dairy foods. Proteins are the building blocks of muscles. Peoplewho play sport need to eat protein-rich foods so that their bodies can make strong muscles. Compiled by: M Nortje Year 9 Science 9
    10. 10.  Required in only small amounts, they are very important to your health. They are both needed to control chemical changes in your body. Endocrine system and nervous system also require a number of these to be able to effectively function and maintain a healthy environment for your cells. Compiled by: M Nortje Year 9 Science 10
    11. 11. A lack of any of the 13 vitamins can cause disease. Diseases caused by a lack of vitamins are called vitamin deficiency diseases. Diseases such as scurvy, rickets and beriberi have become less common as people have become more aware of the importance of vitamins. Deficiencies of minerals can also cause a number of significant problems e.g. In pregnancy the nutrient need change. Compiled by: M Nortje Year 9 Science 11
    12. 12.  An example of this is vitamin C which is needed for the growth and repair of tendons that hold muscle onto bones. Many minerals are found in fresh fruit and vegetables. Compiled by: M Nortje Year 9 Science 12
    13. 13. Compiled by: M Nortje Year 9 Science 13
    14. 14.  Match up the nutrients to the descriptions by drawing a line between the correct nutrient and its description. Finish the table by providing an example for each. Example of a food thatNutrient Match Description contains this nutrient Inorganic molecules required inCarbohydrates small amounts (e.g. iron) Organic molecules required inProteins small amounts for overall good health (e.g. thiamine) Provide cells with energy (e.g.Lipids sucrose) High energy nutrients (e.g. fatsVitamins and oils) Essential for growth and repairMinerals (e.g. enzymes) Compiled by: M Nortje Year 9 Science 14
    15. 15.  Vitamins and minerals help keep your body healthy. Fill in the following table.Areas of the body wherethe vitamins and VITAMIN MINERALminerals are neededHealthy bones and teethHelps prevent illness andaids in wound repairHelps keep blood cellsfunctioningHealthy skin and eyes Compiled by: M Nortje Year 9 Science 15
    16. 16. Compiled by: M Nortje Year 9 Science 16
    17. 17.  Two third of body is water  Water makes up about 70% of the body  Chemical reactions of cells in body use and need water  Blood – 90% water (plasma)  Blood helps carry nutrients around your body and wastes away from it  Water help to cool the body  Survive 40 days without food BUT ONLY 3 without waterCompiled by: M Nortje Year 9 Science 17
    18. 18.  Each day you lose water when: Breathing out (0.5 litres) Sweating (0.5 litres) Urinating (1.5 litres) During exercise, more water is lost from the body as sweat. Dehydrated - lose too much water. A dry throat and mouth and dark-coloured urine are signs of mild dehydration. If you lose more than 20 per cent of your bodys water volume, you could die! Compiled by: M Nortje Year 9 Science 18
    19. 19.  Only found in the walls of plant cells – foods like fruit and vegetables, wholegrain breads and cereals, nuts and seeds. Partially broken down by your digestive system. Although it really does go ‘in one end and out the other’, it serves a very useful purpose. Essential part of your diet. It provides bulk to your food, allowing it to move properly through your intestines. Compiled by: M Nortje Year 9 Science 19
    20. 20. Compiled by: M Nortje Year 9 Science 20
    21. 21.  Without fibre, undigested food travels too slowly through the large intestine, losing too much water. The result is difficulty in releasing the solid food waste from the body, a condition called constipation. Lack of fibre in the diet can also lead to haemorrhoids (varicose veins around the anal passage, also known as piles), bowel cancer and several other diseases. Compiled by: M Nortje Year 9 Science 21
    22. 22.  INQUIRY: INVESTIGATION 3.2 p. 88 Work in group and use samples on the bench. Complete task and questions. Compiled by: M Nortje Year 9 Science 22
    23. 23.  UNDERSTANDING AND INQUIRING: p. 89 - 90 REMEMBER THINK AND INVESTIGATE Compiled by: M Nortje Year 9 Science 23
    24. 24. Compiled by: M Nortje Year 9 Science 24

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