Calling Uae
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Excretion is the process by which waste products of metabolism and other non-useful materials are eliminated from an organism . In vertebrates this is primarily carried out by the lungs , kidneys and skin . This is in contrast with secretion , where the substance may have specific tasks after leaving the cell . Excretion is an essential process in all forms of life. In mammals urine is carried out through the urethra and that is part of the excretory system .
In single-celled organisms , waste products are discharged directly through the surface of the cell.
Green plants produce carbon dioxide and water as respiratory products. In green plants, the carbon dioxide released during respiration gets utilized during photosynthesis. Oxygen is a by product generated during photosynthesis , and exits through stomata , root cell walls, and other routes. Plants can get rid of excess water by transpiration and guttation . It has been shown that the leaf acts as an 'excretophore' and, in addition to being a green plant's primary organ of photosynthesis, is also used as the
Calling Uae