What Causes Bright-Yellow Urine and Other Changes in Color?

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We all know that urine is made of water, certain electrolytes and the color of urine i.e. yellow is due to a chemical which is called urobilin. Its original name was urochrome. It was assumed that this pigment has given color to urine but later on, it was found that many pigments were responsible for the color of urine, so the name has been changed.

why the color pf urine changes from light yellow to bright

Urine is formed mainly by the breakdown of product in the blood cells. Kidney’s functional units are called nephrons. They are found in millions of numbers in kidneys. These nephrons are responsible for the formation of urine by way of filtration, reabsorption and secretion. A normal 170 liters of waste should be excreted out of our bodies in the form of urine. But we never drink this much of water or secrete out. Some amount of water is also re-absorbed into our blood through the process of passive re-absorption.

The nutrition that we consume never gets wasted. Some ions like sodium and urobilins are not re-absorbed into the bloodstream. As we drink, large amount urine starts looking clear as urobilin dilutes into the water.

When a person drinks less amount of water, the urobilin content decreases in urine and urine looks dark yellow. It looks dark yellow as the body tries to maintain some amount of water in the body.

So, when a person takes less amount of water the posterior pituitary gland secretes antidiuretic hormone {ADH}. This secretion of hormone causes the urobilin concentration to increase and makes urine dark yellow. This is a sign of dehydration. When a person takes a lot amount of water, ADH decreases and the water is eliminated in order to maintain water content.

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