What are the main divisions of the nervous system?

The main divisions of the nervous system are:

1. Central Nervous System (CNS):

   • Composed of the brain and spinal cord.
   • Responsible for processing and integrating information, and coordinating and influencing the activity of all parts of the body.

2. Peripheral Nervous System (PNS):

   • Consists of all the nerves outside the brain and spinal cord.
   • Divided into two main parts:
     • Somatic Nervous System: Controls voluntary movements by activating skeletal muscles.
     • Autonomic Nervous System: Regulates involuntary functions such as heart rate, digestion, and respiratory rate. It is further divided into:
       • Sympathetic Nervous System: Prepares the body for 'fight or flight' responses.
       • Parasympathetic Nervous System: Promotes 'rest and digest' activities.

These divisions work together to control and coordinate the body's activities and responses to internal and external stimuli.