CB2

• Reflex arc 


  stimulus detects danger - impulse starts at receptor - impulse passed along sensory neurone - impulse passed along relay neurone - impulse passed along motor neurone - Effector receives impulse to react - response/reflex
• synapse


  Slows down transmission speeds. Useful because neurotransmitters only released from the axon, ensuring that the impulse only flows in one direction. Allows many fresh impulses to be generated in many neurones connected to one neurone - original impulse doesnt need to split and lose strength
• Motor neurones


  carries impulses to effectors
• relay neurones


  short neurones found in spinal cord. Links sensory + motor neurones. Makes up nerve tissue in the brain
• what is the nervous cell made up of?

  spinal cord, brain and nerve cells
• What type of cells detect stimuli?

  Receptor Cells
• What are the two long ‘arms’ of a sensory neurone called?

  dendron and axon
• What is the name of the fatty sheared that surround dendrons and axons?

  Myelin sheath
• Give one example of an effector

  muscle
• Role of dendrites


  Receives impulses from receptor cells
• Role of axon 


  pass impulses to other neurones
• What happens when an impulse reaches a synapse? 


  Impulses reaches axon terminal

  neurotransmitter substance is released across the gap

  this is detected by the next neurone

  new impulse generated