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Questions and Answers
What percentage of the lipids in the diet are triacylglycerols?
What percentage of the lipids in the diet are triacylglycerols?
- 75%
- 85%
- 90%
- 99% (correct)
Which enzyme is secreted by Ebner's glands?
Which enzyme is secreted by Ebner's glands?
- Lingual lipase (correct)
- Gastric lipase
- Intestinal lipase
- Pancreatic lipase
Why is the activity of lingual lipase minimal?
Why is the activity of lingual lipase minimal?
- Food remains for a short time in the mouth (correct)
- The enzyme is not effective in the human mouth
- The mouth's pH is not suitable for the enzyme
- The enzyme is quickly deactivated
What is the optimal pH for gastric lipase activity?
What is the optimal pH for gastric lipase activity?
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In which condition is gastric lipase particularly active?
In which condition is gastric lipase particularly active?
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Which of the following is NOT listed as a reason for the importance of lipids in the diet?
Which of the following is NOT listed as a reason for the importance of lipids in the diet?
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Study Notes
Lipids in Diet
- An average adult consumes 100-150 grams of lipids per day
- Triacylglycerols make up 99% of dietary lipids, with phospholipids, cholesterol, and fat-soluble vitamins comprising the remaining 1%
Importance of Lipids
- Lipids are a primary source of energy for the body
- They supply essential fatty acids
- Lipids provide fat-soluble vitamins (cholesterol)
- Lipids enhance the palatability of food
Digestion of Triacylglycerols
Enzymes Involved
- Lingual lipase
- Gastric lipase
- Pancreatic lipase
- Intestinal lipase
Lingual Lipase
- Secreted by Ebner's glands on the tongue's dorsal surface
- Has minimal effect on triacylglycerol digestion due to short food residence time in the mouth
Gastric Lipase
- Optimal pH is 7, but it cannot act in the adult stomach (pH 1-2)
- May be beneficial in infants' stomach (pH 5) for breaking down milk fats
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Description
Discover the importance of lipids in our diet, including their role in energy supply, essential fatty acids, and fat-soluble vitamins. Learn about the daily consumption of lipids and their composition.
