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quote:Originally posted by DoctorBeaverDo they or not?
quote:The skin is sometimes referred to as the 'third kidney' because of its ability to excrete some of the body's waste products, and sweat glands have some parallels with the nephrons of the kidneys in the way that they respond to controlling influences such as antidiuretic hormone
quote:As you already know, sweat comes out of pores in your skin. As you may not know, sweat is a mixture of three metabolic wastes: water, salts, & urea. So as you sweat, your body accomplishes two things: 1) sweating has a cooling effect on the body, and 2) metabolic wastes are excreted.
quote:Q: Do fish pee?A. Fish do actually pee. Marine fish excrete very low volume of concentrated urine that is formed in the kidneys, as in other vertebrates. For the most part though, their nitrogenous wastes are excreted through their gills during respiration. Pretty cool!