| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
| W |
Digestion happens in the digestive system. |
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Which organ system is involved in digestion? |
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| T |
The parts of the digestive system: Mouth, Oesophagus, Stomach, Liver, Pancreas, Small intestine, Large intestine, Appendix, Rectum, Anus. |
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Which organs are part of the digestive system? |
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| W |
Food is broken down into smaller pieces by chewing in the mouth. |
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How is food broken down in the mouth? |
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| W |
Chewing food into smaller pieces increase the surface area of the food. |
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What is the result of of having smaller pieces of food? |
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| W |
The surface area of food allows more food - saliva contact.
More food - saliva contact speeds up the rate of digestion. |
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How does a larger surface area affect digestion? |
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| T |
Food is churned in the stomach which physically breaks the food down. Stomach acids help to break down the food chemically. |
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How is food broken down in the stomach? Digestion Animation |
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| T |
The nutrients from the digested food are absorbed into the blood stream in the small intestines. |
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Where are the nutrients from absorbed? Class practical: Observing changes in concentration of sugar solution through semi permeable membranes.
Test water for sugars after time to diffuse. |
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| W |
The small intestine has a good blood supply. |
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| T |
The nutrients from the digested food diffuse through the intestine wall. |
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How are nutrients absorbed in the small intestine? |
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| T |
Microscopic projections called villi increase the surface area of the intestine. Therefore increasing the rate of diffusion of useful particles from the intestines to the bloodstream. |
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What is the role of the villi? Explain your answer. |
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| T |
There is a high concentration of nutrients in the intestine and a lower concentration in the blood.
This creates a concentration gradient. |
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Compare the concentrations of nutrients in the small intestine to the blood surround it. |
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| T |
The concentration gradient is great because
- the distance between the digested food and the blood is small because the wall of the intestine is thin.
- there is a good blood supply to remove the nutrients from the blood vessel next to the intestine. |
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Why is there a great concentration gradient? |
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| T |
The small intestine is long (up to 9 meters) to maximise the time in which (complete digestion and) diffusion can happen. |
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Why is the small intestine so long? |
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| T |
Excess water is absorbed back into the blood stream through the large intestines. |
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What happens to the excess water? |
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| W |
Undigested food passes out of the anus as faeces when we go to the toilet. |
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What is faeces? |
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