Bile is involved in digestion in the human body - Leaving Cert Biology - Question 13 - 2008
Question 13
Bile is involved in digestion in the human body.
(i) 1. Where is bile produced?
2. Where is bile stored?
(ii) Where does bile act in the alimentary canal?
(b... show full transcript
Worked Solution & Example Answer:Bile is involved in digestion in the human body - Leaving Cert Biology - Question 13 - 2008
Step 1
1. Where is bile produced?
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Answer
Bile is produced in the liver.
Step 2
2. Where is bile stored?
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Bile is stored in the gallbladder.
Step 3
ii) Where does bile act in the alimentary canal?
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Answer
Bile acts in the duodenum, which is the first part of the small intestine.
Step 4
i) Name the parts labelled A, B, C, D, E and F.
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A = oesophagus
B = stomach
C = small intestine/jejunum
D = rectum
E = appendix
F = large intestine/colon/Bowel.
Step 5
ii) What is the role of peristalsis in the digestive system?
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Peristalsis is the process that pushes food along the gut; it facilitates mechanical digestion and prevents constipation.
Step 6
iii) Where do the products of digestion enter the blood?
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The products of digestion enter the blood primarily in the stomach and small intestine.
Step 7
iv) How do these products of digestion pass into the blood?
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The products pass into the blood by diffusion through the intestinal walls, utilizing both active transport and osmosis.
Step 8
i) For each of the parts labelled B and C in the diagram above, state whether the contents are acidic, neutral or alkaline.
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B = acidic (stomach)
C = alkaline (small intestine).
Step 9
ii) Amylase is an enzyme that is found in saliva. State the substrate and the product of this enzyme.
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The substrate for amylase is starch, and the product is maltose.
Step 10
iii) State two functions of symbiotic bacteria in the alimentary canal.
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Digest cellulose and produce vitamins.
Help to control harmful bacteria at bay and assist with immunity.
Step 11
iv) What is meant by egestion? From which labelled part of the diagram does egestion occur?
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Egestion is the process of getting rid of undigested food waste. This process occurs in part D, which represents the rectum.
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