the nervous system

• 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 is the role of receptors in the nervous system?

  Detect stimuli and send impulses
• What are neurons?

  Nerve cells that transmit impulses
• What is the function of effectors?

  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 type of neuron carries impulses to the central nervous system?

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

  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 at the second synapse in the reflex arc?

  A chemical triggers an impulse in the motor neuron
• What is the response when pulling away from heat?

  Pulling the hand away
• How do reflexes differ from other actions in terms of decision-making?

  Reflexes are automatic with no conscious decision
• Why are reflexes important?

  They help protect us from danger