Nervous system

• What is the purpose of the nervous system?

  to coordinate a response to surroundings e.g thoughts, movements, bodily functions
• What is a neurone?

  A nerve cell that carries an electrical impulse
• What do neurones do?

  Carry electrical impulses from one point to another
• What are the features of neurones?

  Long, thin and have branched connections on the ends for them to pass messages to other nerve cells
• what is needed for one nerve cell to communicate with another?

  A synapse
• What is a synapse ?

  A gap of connection between nerve cells to help one nerve cell to send an impulse to another
• What happens when an electrical

  impulse hits the end of a nerve?

  The neurone releases neurotransmitter chemicals that diffuse past the synapse from one neurone to another . Then binds to the receptor cells in the next neurones membrane so that a new electrical impulse can be made

  
• What is the central nervous system made up of?

  Brain and spinal chord
• What does the CNS do?

  it takes in sensory information (e.g touch, smell) and decides what to do with it and sends orders to the rest of the body to trigger a response
• What do receptor cells do?

  They detect the stimulus
• What do sensory neurones do?

  Carries information from receptors to the central nervous system
• What do motor neurones do?

  they send impulses from the CNS to our effectors (glands or muscles ) to cause a reponse
• What are effectors?

  muscles and glands
• Which part of the neurone is electron impulses passed along?

  Axon
• what are reflexes?

  automatic and rapid responses
• what is the order of a CNS response?


  stimulus>sensory receptor>sensory neurone>CNS>motor neurone>effector>response
• what is a stimulus?

  a change in the environment
• what neurones do impulses travel through the CNS along?

  Relay neurones
• What are all the neurones?

  Sensory, relay, motor
• what are examples of responses to stimuli?

  Muscle contraction, a gland secreting a hormone
• Which neurone is this?

  Sensory

  
• Which neurone is this ?

  Motor

  
• What happens when receptors detect stimuli?

  The information is sent as nervous impulses along sensory neurones to the CNS
• How is information passed in a reflex reaction?

  Receptor>effector
• What do reflex reactions help with?

  Protecting you, for example, moving your hand away from a hot pan
• What is good about the structure of neurones?

  They’re long so it speeds up the impulse as its quicker than lots of neurones being connected
• What do dendrites do?

  They receive electrical impulses and carry them towards the cell body
• What is the role of axons?

  They carry electrical impulses onto the next neurone and away from the cell body
• Which part of the neurone is the axon located?

  At the end
• Which part of the neurone is the dendron located?

  At the front
• Where are receptor cells located?

  in the skin
• Neurotransmitters

  Chemical messengers that carry the electrical impulse across the synapse