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 plant's method of excreting toxic wastes via diffusion. Other waste materials that are exuded by some plants — resin, saps, latex, etc. are forced from the interior of the plant by hydrostatic pressures inside the plant and by absorptive forces of plant cells. These latter processes do not need added energy, they act passively. However, during the pre-abscission phase, the metabolic levels of a leaf are high. Plants also excrete some waste substances into the soil around them.
Waking to the silence in your voice
Waking to the light, I'll now rejoice
Knowing everything could come undone
And knowing that you and I will be one
This day is dragging on, why don't you die?
The nights are carried on by blackened sky
Forever has no end but has a start
Forever your love
Will not fall apart
I know that your love
Will not fall apart
So I'll wake
For the end is crashing through
Seconds pass
In an hour
(Oh) I know I'll go
So please don't take me now
I need to note
Something that's told.
You stood by (Watching)
Because I cannot sleep (Please wake)
Just to say (I'm told)
Sorry I'm told
You stood by (Watching)
Because I cannot sleep (Please wake)
Is this to say (I'm told)
I am told.
Waking to the silence in your voice