MARKS)
1.
The graph shows how an injection of secretin affects the secretion of pancreatic juice by
the pancreas.
00
10.30.2 (17./15.25.170.0 Volume of pancreatic
Julce secreted/cm"
50 -
40 -
Concentration
In pancreatic
juicelarbitrary
units.
30
Hydrogen carbonate
lons
20-
10
Amylase
O
o
10
20
Timo 7minutes
Injection of
secretin
(a)
(0)
Use the graph to describe the effect of secretin on the pancreas. (04rks)
Explain why the concentration of amylase in the pancreatic juice
decreased shortly after the injection of secretin.
(03mks)
(b)
What other digestive secretion is stimulated by secretin.
(02mks)