How the Brain works?

The autonomic nervous system regulates the life support systems of the body reflexively—that is, without conscious direction. It automatically controls the [[KW]] muscles [[/KW]] of the heart, digestive system, and lungs; certain glands; and homeostasis—that is, the equilibrium of the internal environment of the body (see Physiology). The autonomic nervous system itself is controlled by nerve centers in the spinal cord and [[KW]] brain [[/KW]] stem and is fine-tuned by regions higher in the brain, such as the midbrain and cortex. Reactions such as blushing indicate that cognitive, or thinking, centers of the brain are also involved in autonomic responses.