2.77b Thermoregulation

• Hyperthalamis is a region of the brain which responds to the stimuli (temperature of blood)
• Temperature is the stimuli, hyperthlamis is the receptor, skin activity is the responce
• If temperature is too warm, the response of the skin would be sweating, vasoliation and hairs flat
• If temperature is too cold, the response of the skin would be shivering, hair raised and vasoconstriction
• Homeothermic carries out a process called Thermoregulation.
• Mammals body temperature is 37 to 38 degrees celcius

http://www.youtube.com/watch?v=Eb6Fj2ftYfI&feature=related

2.76 Sensitivity

• Sensitivity is the characteristic of the organisms respond to changes in their environment. 
• Changes in the environment is also known as the stimuli which include: Light, temperature, pressure and chemical.
• Organisms are required to have receptors and effectors such as muscles and glands, to detect the stimuli
• Response is used to adapt to the stimuli to survive the changes in the environment.
• The "s" in mrs. gren stands for sensitivity
  http://www.youtube.com/watch?v=U9faLNDFSNY