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Introduction
The steam engine uses the power generated from steam pressure to move. Coal is used in furnaces to heat water in the boiler to generate steam. Steam pressure makes the wheels of the engine move.
Significance of Excretion and Osmoregulation
The different chemical activities in the body produce many by-products several of which are wastes.
Substances Excreted in Animals
The haemoglobin is broken down by liver and finally reduced to the brown pigment called bilirubin. This is eliminated from the bile into the duodenum.
Excretion and Osmoregulation in Man
Man is a highly evolved vertebrate and so the excretory organs are well developed.
Renal Failure and Technology for Survival
The kidney slowly deteriorates and stops functioning. The symptoms are water retention, acidosis, anaemia and increase in blood urea level.
Excretion in Plants
In plants, breakdown of substances is much slower than in animals. Hence accumulation of waste is much slower and there are no special organs of excretion.
Summary
The removal of harmful and unwanted toxic waste products of metabolism is known as excretion.
Question and Answers
Question and Answers 1
Question and Answers 2
Multiple Choice Questions
