Nervous system

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

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

  It is the maintenance of constant internal conditions in the body
• What are the components of an automatic control system in homeostasis?

  • Stimulus
  • Receptor
  • Coordination Center
  • Effector
  • Response
• What are the two parts of the nervous system?

  The central nervous system (CNS) and peripheral nerves
• What does the central nervous system consist of?

  The brain and the spinal cord
• What is the role of receptors in the nervous system?

  They detect stimuli from the environment
• What are neurons?

  They are nerve cells that transmit electrical impulses
• What is the function of effectors in the nervous system?

  They bring about a response to a stimulus
• What are the two types of effectors mentioned?

  Muscles and glands
• How does the nervous system help humans react to their surroundings?

  By coordinating behavior through reflex actions
• What is the reflex arc and its importance?

  • A pathway that controls reflex actions
  • Involves sensory neurons, relay neurons, and motor neurons
  • Important for rapid and automatic responses to stimuli
• What happens when you touch a hot object?

  The stimulus of heat is detected by a receptor in the skin
• What is the role of sensory neurons in the reflex arc?

  They transmit impulses from receptors to the central nervous system
• What occurs at the synapse between sensory neurons and relay neurons?

  A chemical is released that triggers an electrical impulse in the relay neuron
• What happens when the electrical impulse reaches the motor neuron?

  It triggers an electrical impulse that travels to the effector
• Why are reflex actions considered automatic and rapid?

  Because they do not involve decision-making by the conscious brain
• How do reflexes help protect us?

  By enabling rapid responses to potentially dangerous stimuli