Nervous system

• What is a neurotransmitter?

  A chemical used to transmit signals over a synapse
• What does a reflex arc used for?

  To protect you from harm or damage
• Is reflex arc quicker or slower than a response?

  Quicker
• What is the electrical pathway of a reflex arc?

  1. Stimulus
  2. Receptor
  3. Sensory neurone
  4. Motor neurone
  5. Effector
  6. Response
• What is the electrical pathway of an response?

  1. Stimuli
  2. Receptors
  3. Sensory neurones
  4. Brain (CNS)
  5. Relay neurones (in the brain)
  6. Motor neurones
  7. Effectors
• Does a reflex require the brain?

  No
• Is a reflex coordinated or not coordinate?

  Not coordinated
• Is a response coordinated or not coordinate?

  Coordinated
• Does a response require the brain?

  Yes
• What is a receptor?

  The cells that detect a stimuli
• What is a stimuli?

  A change in the environment
• What is a effector?

  The cells that carry out a response
• What is a sensory neurone?

  A neurone that carries signals from receptors to CNS
• What is a motor neurone?

  A neurone that carriers signals from the CNS to the effector cells
• What is a relay neurone?

  A neurone (in the brain) that connects sensory and motor neurones
• What is a response?

  What happens in result to a stimuli
• What are neurones adapted to?

  Carry out electrical signals
• What is the role of an axon?

  Carries signals away from the cell body
• What is the role of the myelinated sheaf?

  Insulates the neurone and speeds up transmition
• What is the node of Ranvier?

  A gap in the myelinated sheaf
• What is found in the cell body?

  • The nucleus
  • Mitochondria
• What is the role of a dendron?

  Carries signals too the cell body
• What is the role of a dendrite?

  Picks up signals from receptors and other neurons
• What is the role of the axon terminal?

  Passes signals to other neurons
• Does a sensory neurone have a cell body?

  Yes
• Does a sensory neurone have a dendron?

  Yes
• Where does a sensory neuron travel?

  all over the body
• Does a sensory neuron have a myelin sheaf?

  Yes
• Does a sensory neuron have dendrites?

  Yes
• Does a sensory neuron have an axon?

  Yes
• Does a relay neuron have a myelin sheaf?

  No
• Does a relay neuron have dendrites?

  Yes
• Does a relay neuron have dendrites?

  Yes
• Does a relay neuron have an axon?

  Yes
• Does a relay neuron have a cell body?

  Yes
• How far does a relay neuron travel?

  Short distances
• Does a motor neuron have a myelin sheaf?

  No
• Does a motor neuron have an axon?

  Yes
• Does a motor neuron have dendrites?

  Yes
• Where does a motor neuron travel?

  All over the body