The occurrence of mucus in urine can be a symptom of various abnormalities of the immune system, the excretory system and/or the reproductive system. Mucus in urine may also indicate the presence of underlying conditions such as urinary tract infection, cystitis or calculi.
The brain sends messages through the spinal cord and nerves of the peripheral nervous system to control the movement of the muscles and the function of internal organs. The basic working unit of the nervous system is a cell called a neuron. The human brain contains about 100 billion neurons.
The autonomic nervous system regulates involuntary functions, such as digestion. This nervous pathway is one example of a function controlled by the autonomic nervous system, which is the part of the nervous system that involuntarily regulates internal body functions.