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    Human Nervous System

    Human nervous system:

    A) Central nervous system (CNS)– consists of the brain and the spinal cord

    B) Peripheral nervous system (PNS) – composed of nerves which connect the CNS to the other parts of the body.

    1. Somatic system (skeletal) – nerves (motor and sensory) that control the muscular system and the external sensory receptors
    2. Autonomic system - autonomic motor neurons that control the internal organs (such as heart, arteries, gastrointestinal tract, glands..)
      Sympathetic system - responds to stressful stimulation – prepares the body for fight or flight response
      Parasympathetic system – involved in relaxation and has an energy conserving function
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