A (Retinol and beta carotene)
Definition
Vitamin A encompasses retinol and beta carotene, which are essential for vision, immune function, and skin health. Retinol is an active form of Vitamin A found in animal products, while beta carotene is a precursor found in plants.
5 Must Know Facts For Your Next Test
- Retinol is directly used by the body and can be toxic at high levels, while beta carotene needs to be converted into retinol.
- Vitamin A deficiency can lead to night blindness and an increased risk of infections.
- Beta carotene is an antioxidant that helps protect cells from damage caused by free radicals.
- The recommended dietary allowance (RDA) for Vitamin A varies by age and gender but generally ranges from 700 to 900 micrograms per day for adults.
- Excessive intake of Vitamin A, particularly through supplements, can lead to hypervitaminosis A.
Review Questions
- What are the primary sources of retinol and beta carotene?
- How does beta carotene function as an antioxidant in the body?
- What are the potential consequences of both Vitamin A deficiency and toxicity?
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Related terms
Hypervitaminosis A: A condition resulting from excessive intake of Vitamin A leading to symptoms like headache, dizziness, and even liver damage.
Night Blindness: A symptom of Vitamin A deficiency characterized by difficulty seeing in low light or darkness.
Antioxidants: Compounds that inhibit oxidation and neutralize free radicals in the body, preventing cell damage.
