Unit 2 nutrition

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UNIDAD 2 DEL LIBRO DE SANTILLANA CON NOMRRE ESSENTIAL NATURAL SCIENCE 2 º ESO Y ISBN 978 84 294 7978 2 ES UN BREVE RESUMEN

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Unit 2 nutrition

  1. 1. UNIT The nutrition function 2 THE NUTRITION PROCESSNatural Science 2. Secondary Education
  2. 2. UNIT The nutrition process 2 NUTRITION OBTAINING SUBSTANCE NUTRIENTS RESPIRATION DISTRIBUTION EXCRETION AUTOTROPHIC HETEROTROPHIC NUTRITION NUTRITION Click on the boxes to find out moreNatural Science 2. Secondary Education
  3. 3. UNIT The nutrition process 2 Obtaining nutrients • Nutrients are the substances (organic or inorganic) that living things ingest and that can be used by their cells. • There are two types of nutrition: • Autotrophic • Heterotrophic Inorganic substances Energy Food Organic Organic nutrients nutrients Click on the pictures to find out moreNatural Science 2. Secondary Education
  4. 4. UNIT The nutrition process 2 Autotrophic nutrition • Autotrophic organisms produce organic nutrients from inorganic substances, such as: • Water • Mineral salts • Carbon dioxideNatural Science 2. Secondary Education
  5. 5. UNIT The nutrition process 2 Autotrophic nutrition • One example is photosynthesis. Plants and algae make organic nutrients using the energy from sunlight. ENERGY Go back to the Start menuNatural Science 2. Secondary Education
  6. 6. UNIT The nutrition process 2 Heterotrophic nutrition • Heterotrophic organisms cannot make organic matter from inorganic matter. Therefore, they obtain nutrients from other organisms or their derivatives. • Animals are an example of heterotrophic organisms. Go back to the Start menuNatural Science 2. Secondary Education
  7. 7. UNIT The nutrition process 2 Respiration • Respiration is the process where a living organism takes in oxygen and expels carbon dioxide. • This process also takes place in cells, which use oxygen to generate energy from nutrients. Mitochondria are the organelles that carry out cellular respiration. Carbon dioxide OxygenNatural Science 2. Secondary Education
  8. 8. UNIT The nutrition process 2 Cellular respiration • In this process, the mitochondrion takes in oxygen, obtains energy from nutrients and expels carbon dioxide and water. Oxygen Carbon dioxide Energy Water Carbohydrates Respiration in a mitochondrion Go back to the Start menuNatural Science 2. Secondary Education
  9. 9. UNIT The nutrition process 2 Substance distribution in unicellular organisms • In unicellular organisms, the cell exchanges substances directly with the environment through the membrane. The exchange of substances in a protozoan Nutrients WasteNatural Science 2. Secondary Education
  10. 10. UNIT The nutrition process 2 Substance distribution in multicellular organisms • In multicellular organisms, different parts of the body specialise in: • Taking in or expelling substances. • Transporting substances. The circulatory The digestive system system of a fish of a bird Go back to the Start menuNatural Science 2. Secondary Education
  11. 11. UNIT The nutrition process 2 Excretion • This is the process by where living beings expel the waste products generated by their activity. The excretory system of a reptile Go back to the Start menuNatural Science 2. Secondary Education

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