Nervous system

• Conscious actions


  One where the brain makes a considered response
• structure

  Stimulus- receptor - sensory nuerones - coordinator- motor nuerones - effector - response
• Reflex arc

  Happens automatically

  Detect stimulus, along with sensory nuerone

  Cuts brain - shorter pathway
• CNS

  Brain and Spine
• Reflexes are important to:

  Avoid danger and harm

  Take care of basic bodily functions like breathing
• 3 nuerones

  motor, sensory and relay
• Sensory nuerones


  Receptor organs to the CNS
• Relay nuerones 


  From sensory nuerones through spinal cord to motor nuerones
• Motor nuerones


  The motor nuerones from CNS to the effectors
• Synapses

  End of dendriles- where 2 nuerones meet
• Synapses


  Diagram

  
• Brain


  The brain is convaluted (folded) to have a greater surface area in the skull

  Structure of nuerones is to enable fast communication
• Nervous system

  Allows humans to react from their surroundings and coordinate their behaviour

  Consists of brain, spinal chord, nuerones and receptors
• Process

  Information from receptors pass along nuerones as electrical impulses to the CNS which is the brain and spinal chord

  The CNS coordinates the response of effectors which may be muscles contracting or glands secreting hormones
• Nuerones


  Diagram

  
• RP - Reaction time


  Instruction

  
• RP - Reaction time


  Method

  
• Reflex reaction

  A fast reaction that bypasses the brain / to protect you from harm
• Effectors

  Muscles and glands
• RP - Reaction time - variables


  Control - height from which ruler was dropped, hand used

  Dependent - Reaction time

  Independent - Number of attempts