Thermo regulation

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

  How the brain monitors body temperature
• What does homeostasis maintain in the body?

  Relatively constant internal conditions
• What is the normal human body temperature?

  37 degrees Celsius
• What part of the brain monitors body temperature?

  The thermo regulatory center
• What do the receptors in the thermo regulatory center respond to?

  The temperature of the blood
• What type of neurons send impulses to the thermo regulatory center?

  Sensory neurons
• What happens when body temperature gets too high?

  The body sweats to cool down
• How does sweating cool the body?

  Evaporation takes energy from the body
• What is vasodilation?

  Widening of blood vessels
• What happens to blood vessels during vasodilation?

  They get wider
• What is the effect of vasodilation on blood flow?

  More blood flows through capillaries
• How does the body lose heat during vasodilation?

  Heat transfers out of the blood
• What happens when body temperature drops too low?

  Blood vessels constrict
• What is vasoconstriction?

  Narrowing of blood vessels
• What is the effect of vasoconstriction on blood flow?

  Less blood flows through capillaries
• What is one way the body generates heat when cold?

  By shivering
• What happens to muscle cells during shivering?

  They increase the rate of respiration
• What does increased respiration in muscles release?

  Heat
• What happens to sweating when body temperature falls too low?

  We stop sweating
• What does the thermo regulatory center do when body temperature changes?

  It detects changes and initiates responses
• What are the responses of the body to high body temperature?

  • Sweating to cool down
  • Vasodilation to increase blood flow
  • Heat transfer from blood to skin
• What are the responses of the body to low body temperature?

  • Shivering to generate heat
  • Vasoconstriction to reduce blood flow
  • Stopping sweating
• How does the control of body temperature exemplify homeostasis?

  • Thermo regulatory center detects temperature changes
  • Body responds to restore normal temperature
  • Maintains internal conditions within a narrow range
• Where can students find questions on body temperature control?

  In the vision workbook
• What is the link provided for in the video?

  To access the vision workbook