(a)[4]
Outline how a negative feedback mechanism operates.
(b)[4]
With reference to Fig. 8.1, describe the role of the nervous system in regulating blood glucose concentration.
(c)[4]
If the core temperature of the human body falls, the hypothalamus sends impulses to trigger several physiological responses, some of which are listed below. For each one, state how it would help to bring the core temperature back to normal: vasoconstriction; shivering; increasing secretion of adrenaline.