Human Digestive System. 1)Describe the structure of the inner wall of the small intestine and...
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![Page 1: Human Digestive System. 1)Describe the structure of the inner wall of the small intestine and explain it’s role in terms of increased surface area for.](https://reader030.fdocuments.in/reader030/viewer/2022033023/56649e2e5503460f94b1e5cc/html5/thumbnails/1.jpg)
Human Digestive
System
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Objectives1) Describe the structure of the inner wall of the small
intestine and explain it’s role in terms of increased surface area for absorption of nutrients.
2) Explain the role of a lacteal and blood capillaries in the transport and absorption of nutrients.
3) Describe the functions of the colon, rectum and anus in relation to absorption of water and mineral salts, temporary storage and egestion of faeces.
![Page 3: Human Digestive System. 1)Describe the structure of the inner wall of the small intestine and explain it’s role in terms of increased surface area for.](https://reader030.fdocuments.in/reader030/viewer/2022033023/56649e2e5503460f94b1e5cc/html5/thumbnails/3.jpg)
Small IntestineWhat happens to the
digested food?
Digested food products, mineral salts and water are
absorbed throughout the small
intestine especially in the ileum.
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Video Time! As you watch the video clip, observe the inner walls of the small intestine .
![Page 5: Human Digestive System. 1)Describe the structure of the inner wall of the small intestine and explain it’s role in terms of increased surface area for.](https://reader030.fdocuments.in/reader030/viewer/2022033023/56649e2e5503460f94b1e5cc/html5/thumbnails/5.jpg)
Inner wall of small intestine
Folds
Villi – minute finger like projections
![Page 6: Human Digestive System. 1)Describe the structure of the inner wall of the small intestine and explain it’s role in terms of increased surface area for.](https://reader030.fdocuments.in/reader030/viewer/2022033023/56649e2e5503460f94b1e5cc/html5/thumbnails/6.jpg)
Inner wall of small intestine
Fold
Villi – minute finger like projections
Microvilli
![Page 7: Human Digestive System. 1)Describe the structure of the inner wall of the small intestine and explain it’s role in terms of increased surface area for.](https://reader030.fdocuments.in/reader030/viewer/2022033023/56649e2e5503460f94b1e5cc/html5/thumbnails/7.jpg)
Inner wall of small intestineWhy is there a need for numerous folds, villi
and microvilli?
To increase surface area for absorption of digested food substances – Increasing the absorption rate of
water and digested food products
![Page 8: Human Digestive System. 1)Describe the structure of the inner wall of the small intestine and explain it’s role in terms of increased surface area for.](https://reader030.fdocuments.in/reader030/viewer/2022033023/56649e2e5503460f94b1e5cc/html5/thumbnails/8.jpg)
Bloodcapillaries
Lacteal
Sugars, amino acids, are absorbed by diffusion into the blood capillaries
Blood capillaries transport sugars and amino acids away from the small intestine.
Glycerol and fatty acids diffuse into the epithelium – form fat globules – enter the lacteals
Lacteal transport fats away from the small intestine.
Epithelium
Villi
One cell thick
Faster diffusion of the digested food products
What is the epithelium one cell
thick?
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Would the absorption of nutrients be affected if digested food substances cannot be transported away by the blood capillaries?
Explain your answer.
Yes. To a certain extent
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The continual transport of digested food substances maintains a concentration gradient for the absorption of digested food substances by diffusion
Lower concentration of digested food substances in the lumen of the small intestine, glucose and amino acids are absorbed by active transport
Mineral salts enter the blood capillaries by active transport
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Activity time!I need a doctor!
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I need a doctor!You are a doctor that specializes on
the ileum. As the doctor of a
patient who is overweight and has
the intentions to lose weight, what
procedures can be done to help the
patient lose weight? Explain your
answer.
Work in pairs/trios.
You have 3 minutes
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Large intestineColon
• Absorb water and mineral salts from undigested food materials
Rectum • Temporarily stores the faeces
• When the rectum contracts, faeces is expelled through the anus
Anus – Egestion/defaecation of faeces
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Let’s Review1) Describe the structure of the inner wall of the small
intestine and explain it’s role in terms of increased surface area for absorption of nutrients.
2) Explain the role of a lacteal and blood capillaries in the transport and absorption of nutrients.
3) Describe the functions of the colon, rectum and anus in relation to absorption of water and mineral salts, temporary storage and egestion of faeces.
![Page 15: Human Digestive System. 1)Describe the structure of the inner wall of the small intestine and explain it’s role in terms of increased surface area for.](https://reader030.fdocuments.in/reader030/viewer/2022033023/56649e2e5503460f94b1e5cc/html5/thumbnails/15.jpg)
Write 3 key things that you learn today
What am I still unsure about?