body temp control and other stuff i forgor

• body temperature must be kept constant
• the body must keep energy gained and lost in a constant balance (through respiration)
• the thermoregulatory centre in your brain contains receptors sensitive to blood temperature flowing through the brain
• where is the thermoregulatory centre?

  the brain
• What does the thermoregulatory centre measure?

  Body temperature and blood temperature
• temperature receptors in the skin give information about skin temperature to the thermoregulatory centre
• What does it mean when effectors work antagonistically?

  work at the same time to achieve a very precise result
• What happens to hair erector muscles when too hot?

  They relax
• What happens to hair erector muscles when too cold?

  they contract and hairs erect
• How does sweat cool you down?

  Evaporates from skin and transfers energy to environment
• What happens to blood vessels supplying the skin when too hot and why?

  Dilation so blood flows closer to surface and helps transfer energy to environment
• What is blood vessels dilating for more blood flow to skin called?

  Vasodilation
• How do standing hairs heat you up?

  trap an insulating layer of air
• What happens to blood vessels when too cold?

  constrict and close off
• What's it called when blood vessels constrict and close off?

  vasoconstriction
• Why do we shiver

  respiration for your muscles contracting transfers energy into the body
• What centre controls how temperature is maintained?

  Thermoregulatory centre