B1 - Understanding Organisms

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1. Reflex Arc

  • stimulus -> receptor -> motor neurone -> effector -> response
  • CNS -> receptor -> sensory neurone -> stimulus-> motor neurone -> effector -> response
  • stimulus -> receptor -> sensory neurone -> CNS -> motor neurone -> effector -> response
  • stimulus -> receptor -> sensory neurone -> motor neurone -> effector -> response
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2. Fats are stored...

  • under the skin and around organs as glucose
  • under the skin and around organs as adipose tissue.
  • under the skin and around organs as glycogen
  • under the skin and around organs as muscle

3. Spinal Reflex

  • receptor -> sensory neurone -> relay neurone
  • CNS -> receptor -> sensory neurone -> stimulus-> motor neurone -> effector -> response
  • receptor -> sensory neurone -> relay neurone ->motor neurone -> effector
  • sensory neurone -> relay neurone ->motor neurone -> effector

4. Carbon Monoxide ...

  • decreases blood pressure by combining with oxygen
  • increases blood pressure by combining with the haemoglobin
  • increases blood pressure by combining with oxygen
  • decreases blood pressure by combining with the haemoglobin

5. Pathogens cause symptoms by...

  • dying and producing waste
  • damaging cells or producing toxins
  • killing white blood cells
  • activating the boy's immune system

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