Thursday, 27 October 2011

2.67b Human organs of Excretion

Recall that the lungs, kidney and skin are organs of excretion.

In the thorax we have lungs, and the metabolic waste the lung excrete is carbon dioxide which is a waste from respiration which we need to release from the body.
The second organ of excretion is the kidneys (we have 2), which excretes excess water, urea (nitrogen waste from amino acids) and salts.
The third organ of excretion is skin and our skin is known to excrete water and salt (sweat) but also a bit of urea.

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