Bleeding gums, loose teeth and poor wound healing are the classic signs of scurvy, which results from the defi

Concept understanding — Vitamin A Deficiency

Vitamin A Deficiency: A Concept-First Explanation

Think of vitamin A as the body's night-vision battery and its skin-and-mucosa repair kit. You don't see it, you don't feel it, but when it runs low, the first sign often comes at dusk — things go blurry when the light fades. That's not a random symptom; it's the body telling you that a specific chemical, retinal, which your eyes need to detect dim light, isn't being made fast enough.

Vitamin A is a fat-soluble vitamin. That means your body stores it in the liver and uses it slowly, so a deficiency doesn't happen overnight. It builds up over weeks or months when your diet lacks foods that provide either preformed vitamin A (from animal sources like liver, eggs, milk) or provitamin A carotenoids (from orange and green vegetables like carrots, spinach, papaya — beta-carotene is the most famous one, which your body converts into vitamin A).

What exactly goes wrong?

The deficiency hits three main systems in the body, and they follow a predictable order.

The eyes are hit first and hardest. The earliest stage is night blindness — you can see fine in bright light, but struggle to see in dim light or darkness. If the deficiency continues, the surface of the eye (the cornea) dries out, a condition called xerophthalmia. In severe, untreated cases, the cornea softens and ulcers form, leading to irreversible blindness. This is the leading cause of preventable childhood blindness worldwide.

The immune system weakens. Vitamin A is essential for maintaining the integrity of mucous membranes — the linings of your respiratory tract, gut, and urinary tract. Without it, these barriers become brittle and leaky, making it easier for bacteria and viruses to enter. A child with vitamin A deficiency gets more frequent and more severe infections, especially measles and diarrhoeal diseases.

The skin and growth suffer. The skin becomes dry, rough, and bumpy — a condition called follicular hyperkeratosis, where hair follicles get clogged with keratin. In children, growth slows down, and bone development can be impaired.

Important

Vitamin A deficiency is not a rare disease. It is a public health problem in many developing countries, especially where diets are heavily based on white rice, maize, or cassava with little variety in vegetables, fruits, or animal products. Pregnant women and young children are the most vulnerable groups.

Why should a commerce or humanities student care? …

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Scurvy, characterized by symptoms like bleeding gums, loose teeth, and poor wound healing, is caused by a deficiency of Vitamin C.

Scurvy is a disease that arises from a severe and prolonged lack of Vitamin C, also known as ascorbic acid. This vitamin is water-soluble and plays a critical role in several bodily functions, most notably in the synthesis of collagen. Collagen is the most abundant protein in the body and is a fundamental component of connective tissues, blood vessels, skin, bones, and teeth.

When there is insufficient Vitamin C, the body cannot produce healthy collagen. This leads to the breakdown of various tissues and structures, manifesting in the classic symptoms described in the question:

Bleeding gums: The connective tissues and blood vessels in the gums become fragile and easily damaged.
Loose teeth: The periodontal ligaments, which are rich in collagen and hold teeth firmly in their sockets, weaken.
Poor wound healing: Collagen is essential for forming new tissue and repairing damaged skin and other structures during the healing process. Without it, wounds heal slowly or not at all.

Let's examine why Vitamin C is the correct answer and why the other options are incorrect.

(a) Vitamin B12: This vitamin is crucial for nerve tissue health, brain function, and the production of red blood cells. A deficiency in Vitamin B12 typically leads to megaloblastic anemia, fatigue, neurological problems (like numbness and tingling), and memory issues, but not the symptoms of scurvy. …

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Q.Bleeding gums, loose teeth and poor wound healing are the classic signs of scurvy, which results from the deficiency of:

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