After a meal, glucose is absorbed from the small intestine, starting the following process.
1. Blood glucose concentration increases.
2. The pancreas responds, secreting insulin into the bloodstream.
3. Insulin causes the liver to convert glucose to glycogen, reducing blood glucose.
4. The pancreas stops secreting insulin.
5. Low levels of glucose cause glucagon to be released.
6. Glucagon causes the liver to break down some of its stored glycogen to glucose, increasing blood glucose.
The graph below shows these changes over a 9-hour period.
At point A on the graph, Select..... is turning into Select.....
Blood Glucose
Concentration
(mg/100 cm³)
140
120
100
80
60
40
20
0
Blood Glucose Levels over a 9-Hour Period
Meal
6 a.m.
Glucose
absorbed
7 a.m.
A
8 a.m.
9 a.m.
10 a.m.
ure II
Meal
12 a.m.
A
Glucose
absorbed
1 p.m.
2 p.m.
3 p.m.

At point A on the graph select is turning into select