(a)[4]
Outline why insulin may be described as a cell-signalling molecule in the endocrine system.
(b(i))[4]
With reference to Fig. 7.1, explain how negative feedback works to regulate the mean blood glucose concentration in the volunteers who ate meal A.
(b(ii))[3]
Suggest explanations for the changes in mean blood glucose concentration of the volunteers who ate meal B.
(i)[4]
With reference to Fig. 7.1, explain how negative feedback works to regulate the mean blood glucose concentration in the volunteers who ate meal A.
(ii)[3]
Suggest explanations for the changes in mean blood glucose concentration of the volunteers who ate meal B.