A more in-depth look at the head
The Stomach
The Duodenum
The duodenum is the first segment of the small intestine. It is a mixing bowl for partially digested food leaving the stomach, now called CHYME, BILE which is produced by the liver and stored in the gall bladder, and PANCREATIC SECRETIONS.
The Ileum
The ileum is the second segment of the small intestine. This is the site for the ABSORPTION of NUTRIENTS! Watching the video below, pay close attention to the adaptations of this part of the small intestine that improve the EFFICIENCY of ABSORPTION.
Probiotics and Enzyme Supplements
Nutrients and Food Tests
The video below discusses where carbohydrates (starch and sugar), proteins and fats are found in our diet and how we can test for them. At the end of the video you should be able to describe how to:
- use iodine to test for starch
- use paper to test for fat
- use benedict's solution + heat to test for glucose
- use copper sulphate + sodium hydroxide to test for protein
Looking at our food tests in more detail this next video shows the action of salivary amylase. Your knowledge of iodine colour changes will be helpful in understanding.
Investigating starch digestion
Amylase breaks down starch into glucose. The next two videos explore how to investigate starch digestion. The first video uses the indicator iodine. Before watching the video copy the table below into your notes and fill in the prediction column.
|
|
Prediction of
what will happen when iodine is added |
Actual
Results |
Explain the
results by discussing the structure and function of the enzyme |
|
Starch +
water |
|
|
|
|
Starch +
amylase |
|
|
|
|
Starch + boiled
amylase |
|
|
|
|
Starch +
pepsin |
|
|
|
This is the second video experimenting with starch digestion. Again, copy the table into your notes and complete the prediction column before watching the video. After watching, complete the second and third columns.
|
|
Prediction of
what will happen when Benedict's Solution is added and heated |
Actual
Results |
Explain the
results by discussing the structure and function of the enzyme |
|
Starch +
water |
|
|
|
|
Starch +
amylase |
|
|
|
|
Starch + boiled
amylase |
|
|
|
|
Starch +
pepsin |
|
|
|
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