Nervous system !

• The cerebellum is involved in coordinating movement, balance, posture, and muscle tone.
• Nervous system


  Network of cells in the body that communicate and respond to information
• Nervous system


  • Incorporates the central nervous system (brain and spinal cord)
  • Responsible for all conscious awareness
  • Cerebral cortex is only 3mm thick but highly developed in humans
  • Distinguishes our higher mental functions from those of other living creatures
• Central nervous system (CNS)


  Made up of the brain and the spinal cord
• Brain


  • Divided into two hemispheres
  • Highly developed in humans
• Endocrine system


  System of glands and hormones
• Endocrine system


  • Works more slowly than the nervous system
  • Hormones are secreted into the blood and have effects on cells with receptors for that particular hormone
  • Glands include the pituitary, thyroid, adrenal, etc.
• The pituitary gland is often called the 'master gland' as it controls the release of hormones from other endocrine glands
• Endocrine and ANS (autonomic nervous system) working together: Fight or flight


  1. Stress perceived

  2. Hypothalamus activates pituitary gland and sympathetic branch of ANS

  3. Sympathetic state activated, physiological changes occur (e.g. increased heart rate)

  4. Adrenaline released

  5. Parasympathetic system returns body to resting state
• Adrenaline


  Stress hormone released from adrenal medulla, triggers physiological changes for fight or flight response
• Parasympathetic system


  Acts as a 'brake', reduces activities of the body that were increased by the sympathetic system, returns body to resting state
• The physiological changes associated with the sympathetic response are experienced as stress, panic or excitement
• The parasympathetic system opposes the sympathetic system and acts to restore the body to its resting state
• Endocrine system


  System of glands that secrete hormones into the bloodstream to communicate with target cells in the body
• Gland


  An organ that secretes a substance
• Hormone


  A chemical substance produced in the body that has a specific regulatory effect on the activity of certain cells or organs