Water soluble vitamins

Question

BlackTom AI · Accepted Answer

Contextualizing the topic: water-soluble vitamins and their basic physiological characteristics are being tested here. We’ll evaluate each choice against what is generally known about these vitamins.

Option a: 'are needed in high quantities once a week' — This is inaccurate. Water-soluble vitamins are required regularly in small amounts, since they are not stored efficiently in the body and excess amounts are typically excreted in urine. The idea of needing large, weekly quantities does not align with how these vitamins function.

Option b: 'are carried in blood by protein carriers and stored in the body in adipose tissue' — This describes fat-soluble vitamins more closely. Water-soluble vitamins are not stored extensively in adipose tissue; they circulate in the bloodstream and are generally excreted when taken in excess. The statement confuses the storage pattern with that of fat-soluble vitamins, making it incorrect for water-soluble vitamins.

Option c: 'are carried in the blood, excreted in the urine' — This matches the typical behavior of water-soluble vitamins. They travel freely in the bloodstream and, because they are not stored in large reserves, any excess is filtered by the kidneys and eliminated in urine. This option aligns with the canonical understanding of water-soluble vitamin metabolism.

Option d: 'provide 17 kJ/g' — This is a mischaracterization of vitamins in general. The energy content of macronutrients is measured in kilojoules per gram (for example, fats ~37 kJ/g, carbohydrates ~17 kJ/g, proteins ~17 kJ/g), but vitamins themselves do not contribute energy in that way. This statement misattributes caloric energy values to vitamins, making it false.

In summary, the statements are evaluated against fundamental facts: water-soluble vitamins are not stored extensively, thus they are not kept in adipose tissue or required in weekly large doses; their primary fate involves excretion when in excess; and they do not carry caloric energy values like macronutrients. The option that coherently reflects these principles is the one describing them as circulating in blood and being excreted in urine.

Water soluble vitamins单项选择题

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