Diana has been fasting for a few days and decides to go for a short run before breaking her fast. The glucose she needs for her run will come from______________________.
A. cellular respiration
B. digestion of starch
C. insulin
D. glycolysis
E. glycogenolysis
Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
Gather Content
· What do you know about production of glucose during fasting? What other information is related to the question?
Choose Answer
· Given what you now know, what information is most likely to produce the correct answer?
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
E. glycogenolysis
Clarify Question
· What is the key concept addressed by the question?
o The question asks about production of glucose during fasting.
· What type of thinking is required?
o You are being asked to apply your knowledge about production of glucose during fasting.
Gather Content
· What do you know about production of glucose during fasting? What other information is related to the question?
o When blood glucose levels decrease, as they do between meals, during periods of fasting, and during exercise, the liver secretes glucose into the blood. This glucose is obtained in part from the breakdown of liver glycogen to glucose 6-phosphate, a process called glycogenolysis.
Choose Answer
· Given what you now know, what information is most likely to produce the correct answer?
o Glycogenolysis breaks down glycogen and releases glucose that Diana can use during her run. Glycolysis and cellular respiration break down glucose and would lower the levels available. Insulin causes removal of glucose from the blood, which is the opposite of what Diana needs to do. Plants store energy as starch, and if Diana has been fasting she will not have starch in her intestines.
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
o This question asked you to apply your knowledge about production of glucose during fasting. If you got the correct answer, great job! If you got an incorrect answer, where did the process break down? Did you think that glycolysis, cellular respiration or insulin would increase blood glucose? Did you think that even though Diana was fasting, she would have starch in her digestive system?
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