Oh god, you do realize how big that question is right? There are many functions but to name a few, the lung help removes carbon dioxide within our body as a product from the mitochondria in our cells. our skin excretes sweat which in turns evaporates, allowing our body to cool down. Our skin also excretes a slightly acidic chemicals onto our skin to kill bacteria. Of course, not to forget; our excretory system removes waste and helps nutrition absorption in our food with a little help from some microorganisms.
