Excretion
The polar bears digestive system is the same as humans. A polar bear's stomach can hold around 20% percent of their weight. A polar bear takes around 20 hours to process a meal of seal blubber through their digestive system. Faeces are liquid, gelatinous and dark brown when the polar bear is feeding mostly on seal blubber.
Polar bears have the capability to sweat from their mouths and noses like dogs, however it is not often that they are required to do this. Polar bears breathe normally and breathe out carbon dioxide.
There is very little research on the kidney and bladder of a polar bear. It is believed to be similar to that of other bear species. This would indicate that they have discrete multireniculate kidneys, which are several miniature kidneys working together.
Polar bears gain most of their water intake from seal blubber. This means that they do not have to urinate often because they are very efficient at using all water contained in this blubber. Once again, little is known, however it is believed to be the same as other mammals.
Polar bears have the capability to sweat from their mouths and noses like dogs, however it is not often that they are required to do this. Polar bears breathe normally and breathe out carbon dioxide.
There is very little research on the kidney and bladder of a polar bear. It is believed to be similar to that of other bear species. This would indicate that they have discrete multireniculate kidneys, which are several miniature kidneys working together.
Polar bears gain most of their water intake from seal blubber. This means that they do not have to urinate often because they are very efficient at using all water contained in this blubber. Once again, little is known, however it is believed to be the same as other mammals.