MCQ Detailed View

Water-soluble vitamins are a group of vitamins that dissolve in water and are not stored in large amounts in the human body. The main water-soluble vitamins include the Vitamin B-complex group (such as B1, B2, B6, B12, niacin, folate, and others) and Vitamin C (ascorbic acid). Since the body cannot store significant quantities of these vitamins, they need to be replenished regularly through diet.

One important feature of water-soluble vitamins is that any excess consumed by the body is not stored but instead excreted through urine. This is because once these vitamins are absorbed into the bloodstream, the kidneys filter out the extra amounts and eliminate them in urine. This mechanism prevents toxicity from overconsumption, which is more commonly associated with fat-soluble vitamins (A, D, E, K), as those can be stored in liver and fat tissues.

Looking at the options:

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  Sweat does contain some minerals and electrolytes, but it is not a significant route for vitamin excretion.

  
  


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  Tears are primarily composed of water, salts, and enzymes, but they do not eliminate vitamins.

  
  


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  Injections are a method of administering vitamins or medicines, not a way to excrete them.

  
  


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  Urine is the correct answer because kidneys regulate vitamin balance by removing excess amounts.

  
  

This property of water-soluble vitamins is why doctors recommend daily intake of Vitamin C and B-complex vitamins through diet or supplements. Foods rich in these vitamins include fruits (especially citrus fruits for Vitamin C), vegetables, grains, and dairy products.

In conclusion, water-soluble vitamins are excreted through urine, highlighting the importance of consuming them regularly while also understanding that excess amounts are naturally flushed out of the body.