Correct Answer - Option 1 : Urochrome
Explanation:
- The yellow colour of the urine is due to the presence of pigment urochrome, which is a breakdown product of haemoglobin from worn-out RBCs.
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Normal urine colour ranges from pale yellow to deep amber - the result of a pigment called urochrome and how diluted or concentrated the urine is.
- Pigments and other compounds in certain foods and medications can change your urine colour.
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Beets, berries and fava beans are among the foods most likely to affect the colour.
So, The yellow colour of urine is due to the presence of Urochrome.
- During summer when the surrounding temperature is high, we lose water in the form of sweat, and direct evaporation considerably.
- Hence kidneys retain water for maintaining the fluidity of the blood and less urine is formed.
- But during winter, the surrounding temperature will be very low.
- There will not be any sweating, no evaporation losses.
- Moreover, to keep the body temperature constant, the blood capillaries in the skin get constricted and the blood pressure is increased.
- The result is that our body gets warmed up.
- In order to maintain the blood pressure normal, the excess water along with the wastes is excreted mostly in the form of urine.
- This is the reason for more urine output and frequent urination under very cool conditions and in winter.
