Question
Sun June 19, 2011 By:

which of the following is not an excretory organ of the mammals- a)liver b)heart c)skin d)kidney

Expert Reply
Sun June 19, 2011
Yes, liver plays an important role in excretion of many substances.
(a) Liver changes the decomposed haemoglobin of the worn out red blood corpuscles into bile pigments bilirubin and biliverdin, which are then passed into the alimentary canal for elimination in the faces.
 (b) The liver also excretes cholesterol, steroid hormones, certain vitamins and drugs through  bile.
(c) Urea is formed in the liver by a cyclic process called as urea cycle. The amino acids that are not needed in the body are deaminated thereby producing ammonia, which is then changed to urea.
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