Biological responses

• What is the reflex pathway?

  1. Stimulus
  2. receptor
  3. Sensory neurone
  4. Relay neurones
  5. Motor Neurones
  6. Effector
  7. Response
• What happens when the sensory neurone reaches the synapse?

  chemical released which diffuses across the to relay neurone
• What happens when the impulse reaches the synapse between the relay and motor neurone?

  diffuses across and start a new electrical impulse
• What happens when the impulse reaches an effector?

  Stimulates a response
• What does the cerebral cortex do?

  Memory, consciousness, language and intelligence
• What does the cerebellum do?

  Coordination of muscular activity
• What does the medulla do?

  Unconscious activities , heartbeat breathing
• What happens when there is a bright light ?

  Circular muscles contract, radial muscles relax, pupil constricts
• What does the eye do when there is a dim light?

  Circular muscles relax, radial muscles contract and pupils dilate
• What happens when you are focusing on a distant object?

  Ciliary muscles relax, suspensory ligaments pulled tight. Lens flat and thin.
• What happens when you are focusing on a nearby object

  Lens more Convex. Ciliary muscles contract, suspensory ligaments slack. Lens more rounded and thick