homeostasis and negative feedback

• what is the definition of homeostasis


  this is the maintenance of a constant internal environment within a living organism
• give three examples of homeostatic control


  regulation of blood glucose levels , regulation of solute potential and regulation of core body temperature
• what effect might a change in temperature and ph have on enzyme-catalysed reactions?why is this important to life


  changes in temperature may result in the decrease of rate of enzyme catalysed reactions or may result in the denaturing of enzymes
• what would a graph representing negative feedback look like

  
• what is the definition of negative feedback


  this is a change in the system that brings about a second change which reverses the first change . to return the system to its set point
• what is the function of a effector in negative feedback


  this makes a response designed to restore the set point or the norm
• what is the function of a receptor or detector in negative feedback


  this monitors the condition and provides a input to the control centre
• what is the function of the control centre or the coordinator in negative feedback


  this evaluates the information form the receptors and provides a response for the effector to do
• what is the order of negative feedback


  receptor , coordination ,effector
• what is meant by positive feedback in the body


  this is when an effector promotes a change
• what are 2 examples of positive feedback

  when oxytocin stimulates the contraction of the uterus at the end of pregnancy and when the skin is cut and the body clots it to stop the bleeding