Nervous System

• What is the nervous system?

  It enables humans to react to their surroundings and to coordinate their behaviour, Central nervous system (CNS) is the brain and spinal cord.
• What does stimuli mean?

  Change in environmental conditions such as light, sound and temperature.
• What is a receptor?

  Specialised cell used to detect changes to the environment around them such as light, sound and temperature.
• What is a sensory N?

  Neurone receiving infomation from the changing environment
• What is a processor?

  Areas of the brain that makes sense of the changes to the environment and decide on the appropriate course of action.
• Whats are relay N?

  REFLEXES ONLY - Neurone that bypasses the brain and creates a rapid, automatic response to avoid danger
• What is a Motor N?

  Neurone that causes a response to the changing surrounding environment
• Whats an effector?

  Area of the body that will bring about the response, either muscles contracting or glands secreting hormones
• What is a response?

  Action taken by the organism
• What is a synapse?

  A gap between 2 neurones
• What is the process of the synapse?

  1. An electrical impulse travels along the axon of the first neurone
  2. At the synapse, a chemical neurotransmitter is released
  3. it diffuses across the synapse
  4. When reaching the dendrite of the second neurone, it triggers a new electrical impulse
• These are the 3 different types of neurons

  
• What is Homeostasis?

  Maintaining a constant internal environment. Includes : blood glucose levels, body temperature, water content.