2.2.6 digestive system draw, label, annotate

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2.2.6 digestive system draw, label, annotate

  1. 1. Draw – Label – Annotate (Starter activity) Previously you have learnt about the digestive system. Get ready, make sure you have access to: • (sharp) pencil • ruler • A3 paper By Chris Paine https://bioknowledgy.wikispaces.com/
  2. 2. Draw – Label – Annotate Guidelines • You are drawing, labelling and annotating the digestive system: 2.26 describe the structures of the human alimentary canal and describe the functions of the mouth, oesophagus, stomach, small intestine, large intestine and pancreas • The group will the highest total will receive a reward.
  3. 3. Draw – Label – Annotate Guidelines 1. Form groups of three students 2. Everyone draws a digestive system DO NOT Label (2 mins) 3. Pass your drawing to the next person in your group 4. Everyone labels the drawing they have in front of them DO NOT Annotate and DO NOT add to the drawing (1 min) 5. Pass the labelled drawing to the next person in your group (you should be looking at a different drawing again) 6. Annotate EXISTING LABELS only (3 mins) 7. Now for the reflection: trade your group’s papers with a different group (the teacher might ask you to rotate papers between groups rather than trade) 8. Mark the drawings according to the mark scheme you are shown on the next slides
  4. 4. Labelling (1 mark each, 10 max) Mouth Oesophagus Liver Gall bladder Large Intestine Anus Stomach Pancreas Small intestine Rectum
  5. 5. Annotations (1 Mark for each, 10 max) Organ Function in the digestive system Mouth • Ingestion of food • mechanical digestion/ breaking up larger food pieces into smaller pieces (mastication/chewing) • Salivary gland releases amylase to digestive starch (need two correct points for the mark) Oesophagus • By peristalsis moves food from the mouth to the stomach Stomach • HCl -> kills pathogens/harmful bacteria • Pepsin (protease) -> starts protein digestion • Muscular wall -> churns/mixes food to help digestion (need two correct points for the mark) Small intestine • Enzymes from the pancreas/named examples digest large insoluble molecules (into smaller soluble ones) • Small soluble molecules (and water) are absorbed into the blood (need both correct points for the mark)
  6. 6. Annotations (1 Mark for each, 10 max) Organ Function in the digestive system Large intestine • Water is absorbed into the blood Pancreas • Releases digestive enzymes – amylase, trypsin (protease), lipase Liver • Makes bile Gall bladder • Concentrates/stores bile Rectum • Stores faeces Anus • Egests faeces
  7. 7. Deductions • -1 for for label lines not drawn with a ruler • -1 arrow heads on label lines (I know the example diagram did have arrow heads, but this is bad practise) • -1 for drawing <1/2 a page in size • -1 for shading • -1 for sketching rather than outlining n.b. deductions are per drawing, not per incidence
  8. 8. Reflection • Total the marks by group to see which group did best – Rewards for the best group • In groups discuss what group you are marking did well and what they could improve on. Comments should be in terms of “next time they should …” • As a class share your “next time” recommendations is there a lot of similar mistakes being made? • Return drawings • Using your feedback produce an excellent example drawing to add to your notes

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