Autonomous nervous system comprises of all the nerves present in the involuntary organs like heart, stomach, lungs. These nerves are categorized as Afferent nerves and Efferent nerves. Afferent nerves carry impulses from the sensory organs to the brain. Efferent nerves carry impulses from the brain to the sensory organs.
There are three parts to your autonomic nervous system: 1 The sympathetic system is responsible for your body's 'fight or flight' reaction. 2 The parasympathetic system looks after the workings of your body during rest and recuperation. It also controls your heart rate and body temperature under normal conditions. 3 The enteric system controls the workings of your gut.