Homeostasis is the body’s attempt to maintain a constant internal environment. It involves keeping many internal factors at more or less constant levels. The factors include body temperature and properties of the blood as the right levels of acidity, salts, glucose,... in order for cells to function normally.

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The kidneys are the main organs in excretion of wastes from the blood, but several other organs are also involved in this process as liver, skin, and lungs.
• The liver breaks down excess amino acids in the blood to form ammonia, and then converts the ammonia to urea, a less toxic substance. The liver also breaks down other toxic substances in the blood, including alcohol and drugs.
• The skin eliminates water and salts in sweat.
• The lungs exhale water vapor and carbon dioxide.
Those organs can be considered part of the excretory system but, in the study of excretion process we are going to refer only to the urinary system
Finally, a second video fron HEATINCca where is explained the Urinary system and the homeostasis
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