controlling body temp

• how does the body temperature keep constant?

  the body balances the amount of energy gained (respiration) and lost to keep the core body temperature constant
• what is the normal body temp?

  37 degrees
• what is the thermoregulatory centre?

  it’s located in the brain which contains receptors that are sensitive to the temperature of the blood flowing through the brain
• how is body temperature controlled?

  negative feedback
• what happens when temperature receptors detect the body temp to be too high?

  • the thermoregulatory centre acts a coordination centre - it receives information from the temperature receptors and triggers the effectors automatically
  • effectors eg sweat glands produce a response and counteract the change
• what are antagonistic effectors?

  Antagonistic effectors are muscles that work in opposition to each other to produce movement. for eg on effector heats and another cools - they’ll work at the same time to produce a precise temperature
• what does ur body do when you’re too hot?

  • hairs lie flat
  • sweat is produced by sweat glands and evaporates from the skin
  • blood vessels supplying the skin dilate so more blood flows close to the surface of the skin (vasodilation) helps transfer energy from skin > environment
• what happens when your body is too cold?

  • hairs stand up to trap heat (insulating layer)
  • no sweat produced
  • blood vessels constrict too close of the skins blood supply (vasoconstriction)
  • when you shiver - needs respiration which transfers energy to warm the body
• where is the thermoregulatory centre located?

  the brain
• where are the receptors that detect the temperature of the blood located?

  in the thermoregulatory centre