thermoregulation

• Why must the bodies temperature be controlled

  • the bodies temp must be controlled at 37 because its the optum temp for enzymes and altering it means a decrease of enzyme controlled reactions
• what does the main ideal temp of the body depend on

  • receptors
  • hypothalamus
  • effectors
• what is the function of the receptors

  • detect changes in temp in the blood and send it to the hypothalamus
• what is the function of hypothamlus

  • coordinates a response and sends it to the neurones
• What happens when the body is too cold

  • blood vessels near the body constrict so less blood is near the surface and less energy is transferred to surrondings
  • the body shivers creating heat and energy as it increases the rate of respiration
  • the hairs on erector muscles contract and create a warm insulating layer of air
• what does your body if it's too hot

  • sweat - sweat is released via pores in epidermis heat energy is used to tevaporate sweat so increase heat transfer from skin to environment decreases temp.
  • vasodilation - the blood vessel near the body relax meaning more blood flows near the surface and more energy transferred to surrondings
  • erector muscles relax less air is trapped cools body down