the nervous system

• What are the components of an automatic control system?

  Stimulus, receptor, coordination center, effector, response
• What are the two parts of the nervous system?

  Central nervous system and peripheral nerves
• What does the central nervous system consist of?

  Brain and spinal cord
• What do receptors do in the nervous system?

  Detect a stimulus and send impulses
• What is another term for nerve cells?

  Neurons
• What is the role of effectors in the nervous system?

  Bring about a response
• What are the two types of effectors mentioned?

  Muscles and glands
• How does the nervous system help humans?

  Enables reaction to surroundings and behavior coordination
• What is the reflex arc?

  A pathway for reflex actions
• What happens when you touch a hot object?

  The reflex arc is activated
• What is the stimulus in the reflex arc when touching a hot object?

  Heat
• What type of neuron carries impulses to the central nervous system?

  Sensory neuron
• What is a synapse?

  A junction between neurons
• What happens at the synapse between the sensory neuron and relay neuron?

  A chemical is released to trigger an impulse
• What triggers an electrical impulse in the relay neuron?

  A chemical released from the sensory neuron
• What is the role of the motor neuron in the reflex arc?

  Transmits impulses to the effector
• What is the effector in the reflex arc when touching a hot object?

  A muscle that contracts
• What is the response when you touch a hot object?

  Pulling the hand away
• Why are reflexes important?

  They help protect us from danger
• How do reflexes differ from other actions in the nervous system?

  They are automatic and rapid
• What does the central nervous system act as in reflex actions?

  A coordinator
• What part of the brain is involved in reflex actions?

  No decision-making by the conscious brain
• What is the significance of reflex actions being automatic?

  They allow for quick responses to danger