nervous system

• Autonomic nervous system (ANS) system operates involuntarily. the sympathetic and parasympathetic nervous systems.
• CNS


  The CNS is made up of the brain and the spinal cord.

  • The right hemisphere controls the left side of our body.

  • The left hemisphere controls the right side.

  The brain is the center of all conscious awareness and where all decision-making takes place.

  At the base of the brain is the brain stem. The key function is to control many basic functions, such as regulating sleep and consciousness. The brain stem connects the brain to the spinal cord. The spinal cord carries incoming and outgoing messages between the brain and the rest of the body.
• PNS


  The word peripheral means 'around the outside'. The PNS supports the actions of the CNS, receiving messages from the CNS and sending messages to it. This is achieved through the actions of millions of nerve cells called neurons.

  The PNS is subdivided into the autonomic nervous system (ANS) and the somatic nervous system (SNS).
• SNS


  The SNS controls the voluntary movement of our muscles. Unlike the ANS, the SNS is a voluntary system because most of our movement is under our control. The one exception is reflex responses controlled by the SNS, such as the one described below.

  The SNS also takes in information from sensory organs, such as the eyes and the skin.
• ANS

  Controls the fight-or-flight response. Tries to maintain homeostasis.

  Is made up of two divisions:

  1 The sympathetic nervous system, which is our stress response where fight, or flight occurs (e.g. increased heart rate and muscle tension).

  2 The parasympathetic nervous system (our resting state), where bodily functions are in their normal state.
• NERVOUS SYSTEM

  
• autonomic nervous system • breathing (faster) • heart beating (faster) • starting to sweat/sweating
• somatic nervous system

  • walking • smiling • standing up straight/changing posture
• Sympathetic state

  Increase heart rate - more oxygen

  Increase breathing rate - more oxygen

  Dilates pupils - can take in more light, see threats better

  Inhibits digestion - 

  Inhibits saliva production
• Parasympathetic

  Lowers heart rate

  lowers breathing rate

  Constricts pupils

  stimulate digestion

  stimulate saliva production
• The ANS consists of both the sympathetic division and parasympathetic division. The sympathetic division of the ANS produces physiological changes in response to a threat whilst the parasympathetic division of the ANS restores normal physiological conditions.
• Central nervous system (CNS) is made up of the brain and the spinal cord.
• Nervous system consists of the CNS and the PNS
• Peripheral nervous system (PNS) transmits information about voluntary activity, communicating between the CNS and the rest of the body (muscles and glands). Coordinates some reflex responses.
• Somatic nervous system (SNS) transmits information from sense organs to the CNS. It also receives information from the CNS that directs muscles to act.