Chapter 9

Homeostasis (CH 9 Nelson, QCE pg. 174-184)

      recall that homeostasis involves a stimulus-response model in which change in the condition of the external or internal environment is detected and appropriate responses occur via negative feedback

      recognise that sensory receptors detect stimuli and can be classified by the type of stimulus

      chemoreceptor

      thermoreceptor,

      mechanoreceptor

      photoreceptor

      nociceptor

      recall that effectors are either

      muscles (which contract in response to neural stimuli)

      glands (which produce secretions)

      interpret feedback control diagrams for either nervous or hormonal systems

      stimulus

      receptors

      control centre

      effector

      communication pathways

      understand that metabolism describes all of the chemical reactions involved in sustaining life

      is either catabolic or anabolic

     

explain why changes in metabolic activity alter the optimum conditions for catalytic activity of enzymes (with reference to tolerance limits).