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.
Science Main Index. The digestive system is under control of the Autonomic Nervous System (ANS). The ANS controls body process that are not under our conscious control. This means that when we eat food, we don't need to think about how our body will digest it. The Autonomic Nervous System automatically does what needs to be done. The digestive system is also controlled by hormones released by glands in the body.