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?

  Maintaining constant internal conditions
• 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 is the role of receptors in the nervous system?

  Detect stimuli and send impulses
• What are neurons also known as?

  Nerve cells
• What are the two types of effectors mentioned?

  Muscles and glands
• What is the function of effectors in the nervous system?

  Bring about a response
• 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?

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

  Sensory neuron
• What is released at the synapse between the sensory neuron and relay neuron?

  A chemical that triggers an impulse
• What is the role of the relay neuron?

  Passes impulses within the CNS
• What happens at the second synapse in the reflex arc?

  A chemical triggers an impulse in a motor neuron
• What does the motor neuron do 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 reflex actions important?

  They are automatic and rapid for protection
• How does the brain usually function in decision-making?

  It coordinates actions in most cases
• How do reflexes differ from other actions?

  Reflexes do not involve conscious decision-making
• What is the significance of the rapid nature of reflexes?

  They help protect us from danger
• Where can you find questions on the nervous system and reflex arc?

  In the vision workbook
• Withdrawal reflex