The nervous system

• What should you be able to describe by the end of the video?

  Structure of the nervous system and reflex arc
• What is homeostasis?

  Keeping internal conditions constant
• 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 are neurons also known as?

  Nerve cells
• 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 first step in the reflex arc when touching a hot object?

  The stimulus is detected by a receptor
• What type of neuron carries impulses to the central nervous system?

  Sensory neuron
• What occurs at the synapse in the reflex arc?

  A chemical is released to trigger an impulse
• What is the role of the relay neuron?

  Passes impulses within the central nervous system
• What happens after the relay neuron in the reflex arc?

  Impulse triggers a motor neuron
• What is the effector in the reflex arc when touching a hot object?

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

  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
• Where can you find questions on the nervous system and reflex arc?

  In the vision workbook
• What is the role of the central nervous system in reflex actions?

  Acts as a coordinator for reflexes