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Excretory Products and their Elimination

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
 Discuss the composition of urine.

Composition of urine :

Nature : Urine is acidic in nature and its pH varies between 4.5 to 8.0.

Colour : Urine is pale yellow due to the presence of urochrome, a pigment.

Odour : Urine has a faint odour due to bad smelling urinod. On standing, urea changes to ammonia and produces a strong offensive pungent smell.

Quantity : A normal adult excretes about 1 to 1.8 litre of urine in 24 hours.

Chemical composition : An analysis of urine shows that urine contains 95% water, 5% nitrogenous metabolic waste products like urea, hippuric acid, creatinine etc. and non-nitrogenous waste products like oxalic acid, excess of vitamin etc.

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What is Bowman's capsule?

The double walled cup like structure present at the starting of the renal tubule is Bowman's capsule. It encloses the glomerulus capsule. 
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 What is uremia ?

Uremia is the accumulation of urea in the blood due to the malfunctioning of the kidneys. The urea accumulation is harmful and may lead to kidney failure. 

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What is glomerulonephritis ?

Glomerulonephritis is the inflammation of glomeruli of the kidney. 
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What is the ultimate method for the correction of acute renal failure?

Kidney transplant.
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Name three uricotelic animals.

The uricotelic animals are
1. Birds
2. Reptiles
3. Insects

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