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Excretion is the process of removing unwanted ( 3G, metabolic, salty, unmetabolised ) waste from the body. The main organs of the excretory system are the ( gall bladder, venules, ureters, kidneys ). These organs filter wastes like urea and excess ( salts, urine, ammonia, sugars ) and water from the body. This waste then travels down the ( kidney stones, dorsal aorta, urethra, ureter ) to the bladder. When the bladder is full, urine is expelled from the body via the ( bladder, urethra, vena cava, ureter ).