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 nervous system has lots of very specific functions, however the four main functions are sensory, motor, integrative and regulation of the bodies functions. The central nervous system controls everything from breathing to heartbeats.he central nervous system contains the brain, spinal cord, and retina. The peripheral nervous system consists of sensory neurons, clusters of neurons called ganglia, and nerves connecting them to each other and to the central nervous system.