(a)[1]
Name the mechanism that keeps blood glucose concentration within narrow limits.
(b(i))[1]
State the way glucagon gets to the liver cells.
(b(ii))[2]
With reference to Fig. 6.1, identify enzyme A and second messenger B.
(b(iii))[1]
State the purpose of the enzyme cascade.
(b(iv))[1]
State the role of the final enzyme in the pathway, glycogen phosphorylase.
(c)[4]
A biosensor is used to measure blood glucose concentration to check that it is within the normal range. Describe how a glucose biosensor operates.