reflexes

• How can reaction time be measured

  Ruler drop test or by a computer (more accurate than ruler)
• reflex

  automatic response to a stimulus
• What does the central nervous system act as?

  processing centre
• What is the central nervous system made up of?

  brain and spinal cord
• Synapse definition and how does it work?

  A gap between two neurone.

  Electrical impulse arrives, electrical is turned into chemical (neurotransmitter) diffuse across the synapse, neurotransmitters bind to receptors and Trigger new electrical Impulse
• Reflex arc order

  stimulus, receptor, sensory neurone, relay neurone (in cns), motor neurone, effector, response
• What is the nervous system?


  Communication system that works together to allow your body to respond to changes in in the environment
• What brings out the response for effectors?

  Muscles (contract), glands (release chemicals)
• What is the bodies system to keep control order?

  Stimulus -> receptors (detect stimulus) -> coordination centres (process info) -> effectors (responce)
• What does homeostasis control

  Blood glucose concentration, temperature, water levels, iron levels, urea, CO2 level
• What is homeostasis

  Maintaining a stable internal environment
• negative feedback


  A type of regulation that responds to a change in conditions by initiating responses that will counteract the change.
• Where do sensory neurons carry information to and from?

  from receptors to cns
• Where do motor neurons carry information to and from?

  from cns to effector
• How does info get around the body

  nerves and hormones
• How is the CNS connected to the rest of the body?

  neurone
• basal metabolic rate


  speed at which chemical reaction occur in the body at rest
• Nerves

  • Fast action
  • Short time
  • Precise area