Comprehensive review of vitamins and minerals essential for human health and disease prevention.
Key Concepts:
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Which of the following vitamins is classified as fat-soluble, meaning it requires dietary fat for absorption and is stored in the body's liver and fatty tissues?
Vitamin A
Vitamins are classified by solubility. Vitamins A, D, E, and K are fat-soluble and stored in the body, whereas B-complex vitamins and Vitamin C are water-soluble.
A patient presents with night blindness and dry, scaly skin. A deficiency in which of the following vitamins is the most likely cause?
Vitamin A
Vitamin A is essential for the formation of rhodopsin, a pigment in the retina responsible for vision in low light. Deficiency leads to nyctalopia (night blindness) and xerophthalmia.
Which vitamin is synthesized in the skin upon exposure to ultraviolet (UV) radiation from sunlight?
Vitamin D
Vitamin D (cholecalciferol) is synthesized in the skin when 7-dehydrocholesterol reacts with UVB light.
A 5-year-old child presents with bowed legs and skeletal deformities. This condition, known as Rickets, is caused by a deficiency in:
Calcium and Vitamin D
Rickets is a childhood condition caused by Vitamin D, calcium, or phosphate deficiency, leading to soft and weak bones.
Which vitamin is known chemically as ascorbic acid and is essential for collagen synthesis?
Vitamin C
Vitamin C is also known as ascorbic acid. It is a cofactor for enzymes that hydroxylate proline and lysine in collagen synthesis.
Gingivitis, petechiae (small blood spots), and delayed wound healing are classic signs of Scurvy. This results from a severe lack of:
Vitamin C
Scurvy is the clinical manifestation of severe Vitamin C deficiency, leading to the breakdown of collagen-rich tissues.
A patient on long-term antibiotic therapy may develop a deficiency in this vitamin because it is partially synthesized by intestinal bacteria. Its primary role is in blood clotting.
Vitamin K
Vitamin K is essential for the synthesis of clotting factors II, VII, IX, and X. It is produced by gut flora, which can be disrupted by antibiotics.
Which B-vitamin is correctly matched with its chemical name?
Vitamin B3 - Niacin
The correct pairings are: B1 (Thiamine), B2 (Riboflavin), B3 (Niacin), and B12 (Cobalamin).
A deficiency in Thiamine (Vitamin B1) is associated with which condition, characterized by nerve damage and muscle wasting?
Beriberi
Beriberi is caused by thiamine deficiency. 'Dry' beriberi affects the nervous system, while 'wet' beriberi affects the cardiovascular system.
Which nutrient is critical for women of childbearing age to prevent neural tube defects (like spina bifida) in the developing fetus?
Folate (Vitamin B9)
Adequate Folate intake before and during early pregnancy is crucial for proper closure of the neural tube.
