Reflex arc

• What is an effector

  Muscle or gland that carry out a response after receiving an impulse from a motor neurone
• What is a stimuli

  Change in internal or external environment
• What is a receptor

  Cells or proteins in cell surface membrane that detect a stimuli
• What Is an effector

  Cells that bring about a response to a stimulus
• How does the nervous system send information as electrical impulses?

  1. stimuli detected by receptor
  2. Electrical impulses travels along sensory neurone towards CNS where neurotransmitters are released at synapse
  3. Impulse releases relay neurone going across synapse to motor neurons
  4. Impulse travels along effector bringing a response