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Life Processes in Animals

One path, and a job at every stop

Food goes in at one end. It follows one path. Swap the cards until the stops are in order.

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The idea

The path runs through the alimentary canal, the long food tube. The liver and the pancreas add digestive juices to the small intestine. A digestive juice is a liquid that helps digest food. Saliva is the digestive juice in the mouth. Starch is a food part in rice and roti. Stool is the food waste that leaves the body.

The stops, in order
StopJob
MouthTeeth crush food. Saliva starts on starch
Food pipeA wave of squeezing pushes food down
StomachChurns food. Juice works on protein
Small intestineDigestion finishes. Food passes into the blood
Large intestineTakes back water and some salts. Waste becomes stool
AnusThe stool leaves
The path: mouth, food pipe, stomach, small intestine, large intestine.
Step 1 of 6
  1. The path: mouth, food pipe, stomach, small intestine, large intestine.
  2. Mouth: chews food and mixes it with saliva.
  3. Food pipe: pushes it down in a wave.
  4. Stomach: churns it. Most food does not cross into the blood here.
  5. Small intestine: finishes it. Most crosses in here.
  6. Large intestine: takes back water. What is left leaves.

Food takes one path. It goes mouth, food pipe, stomach, small intestine, large intestine, anus.

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This track

  1. 0 Start here
  2. 1 Digestion, absorption and egestion
  3. 2 One path, and a job at every stop
  4. 3 Saliva and starch
  5. 4 Ruminants and birds
  6. 5 Checkpoint: what a body does with food
  7. 6 Breathing is not respiration
  8. 7 Lungs, gills and moist skin
  9. 8 Getting food and oxygen around
  10. 9 What a body cannot use has to leave
  11. 10 The path of air
  12. 11 How the chest moves
  13. 12 Gases swap at the alveoli
  14. 13 Villi give food a way in
  15. 14 Checkpoint: the breathing path, the chest and villi
  16. 15 The big picture
  17. 16 Track quiz

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