The central nervous system comprises the brain and spinal cord, structures responsible for integrating information received from the body and the external environment, as well as for coordinating motor, cognitive, autonomic, and emotional responses. It controls essential processes such as voluntary movement, cognition, memory, emotional regulation, respiration, heart rate, and endocrine activity.

Central nervous system health may be influenced by ageing, stress, inadequate nutrition, smoking, sleep deprivation, and a sedentary lifestyle. In stressful situations, information is processed by cerebral structures involved in emotional regulation, such as the amygdala and hypothalamus, which may lead to activation of the adrenal glands and the release of adrenaline and cortisol. Acute stress may manifest as palpitations, increased blood pressure, accelerated breathing, and mood changes, whereas chronic stress may be associated with sleep disturbances, irritability, fatigue, reduced energy levels, and memory impairment.

The HumanoPedia medical dictionary provides essential information on the central nervous system, stress, and the mechanisms through which the body responds to stressors. This facilitates a clearer understanding of the role of the central nervous system in maintaining physical and psychological homeostasis.