Living Things Undergo Life Processes
B.)Excretion
B.)Excretion
Excretion is the removal of toxic materials, the waste products of
metabolism and substance in excess of requirements from organisms.
Metabolism is chemical reactions taking place inside cells, including
respiration.
The body excretes three main waste materials. These are Carbon
Dioxide, Urea and Water. Excretion is a very important feature to us
because without it toxic substances will build up in our bodies and kill
us. It also helps in maintaining the composition of body fluids.
The Excretory System of humans is made up of 4 structures: Two
kidneys, two ureters, a bladder, and the urethra. The kidneys act as a
filter to filter the waste products from the blood, the ureters are
tubes that transport the main waste products (urine) from the kidneys to
the bladder, where it is stored until it is excreted out of the body
through the urethra.
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