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Questions and Answers
What role does Vitamin A play in vision, specifically in low light conditions?
Vitamin A is needed to form visual purple, a pigment in the retina that enables dim light vision.
Identify two essential functions of Vitamin A related to immune health.
Vitamin A strengthens the body's immunity against infections and is required for the production and activity of white blood cells.
Explain how Vitamin D contributes to bone health.
Vitamin D ensures the absorption of calcium, allowing calcium to be deposited into bones for mineralisation.
What are the consequences of a deficiency in Vitamin A regarding cell protection?
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List two animal sources and two plant sources of Vitamin D.
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Study Notes
Vitamin A
- Vital for forming visual purple, a pigment essential for night vision in the retina.
- Critical for producing and maintaining the protective tissue lining of body organs.
- Enhances immune function by aiding in white blood cell production and activity.
- Functions as an antioxidant, shielding body cells from damage by free radicals, which may lead to diseases like cancer and heart disease.
Good Sources of Vitamin A
-
Plant sources:
- Carrots
- Papayas
- Spinach
- Sweet potato leaves
-
Animal sources:
- Cheddar cheese
- Egg yolk
- Liver
Vitamin D
- Facilitates calcium absorption, crucial for proper bone mineralization and health.
Good Sources of Vitamin D
- Produced by the skin through sunlight exposure; just 5 minutes of exposure to arms and legs twice a week can generate sufficient levels.
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Plant sources:
- Fortified breakfast cereals
- Shiitake mushrooms
-
Animal sources:
- Egg yolk
- Liver
- Sardines (with edible bones)
- Tuna
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Description
Explore the vital functions of Vitamin A in this quiz. Learn how it contributes to vision, tissue protection, immune system strength, and antioxidant activity. Test your knowledge about this essential fat-soluble vitamin!
