In humans, a lack of which of these nutrients can cause the condition known as night blindness?

Rationale

Vitamin A deficiency in humans can cause the condition known as night blindness.

Vitamin A plays a crucial role in vision by maintaining the health of the retina, the part of the eye that detects light and color. Night blindness, or nyctalopia, is a condition characterized by difficulty seeing in low light or darkness and is one of the early signs of vitamin A deficiency.

A (Calcium) YOUR ANSWER

Calcium is an essential nutrient for human health, playing key roles in bone health, nerve function, and muscle contraction. However, it does not directly contribute to visual function or the health of the retina. Therefore, a lack of calcium does not cause night blindness.

B (Niacin) YOUR ANSWER

Niacin, or vitamin B3, is important for the conversion of food into energy, as well as cellular repair and function. While niacin deficiency can lead to a condition known as pellagra, which includes symptoms such as skin changes, digestive issues, and neurological problems, it does not cause night blindness.

C (Vitamin D) YOUR ANSWER

Vitamin D aids in the absorption of calcium and phosphate, nutrients that are essential for bone health. While a deficiency in vitamin D can lead to bone diseases such as rickets in children and osteomalacia in adults, it does not affect the visual system or cause night blindness.

D (Vitamin A) CORRECT

Vitamin A contributes directly to the health of the retina, specifically in the formation of a protein called rhodopsin, which aids in low-light vision. A deficiency in vitamin A can lead to a decrease in rhodopsin, causing difficulties in seeing in low light or darkness, a condition known as night blindness.

Conclusion

Among the options presented, only a deficiency in Vitamin A can lead to night blindness. While calcium, niacin, and vitamin D are all essential for human health, they do not directly contribute to visual function. Vitamin A is vital for maintaining retinal health and enabling low-light vision, and its deficiency results in conditions like night blindness.

In humans, a lack of which of these nutrients can cause the condition known as night blindness?

Vitamin A deficiency in humans can cause the condition known as night blindness.

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