To review:
The mechanism used by the human body for supplying glucose to its organs when food intake stops.
Introduction:
The main source of energy in the human body is glucose. The human body gets glucose from food. The body stores the glucose as glycogen. The human body uses this glycogen as a source of glucose when there is lack of glucose intake. When the stored glycogen is used up, the body uses other molecules as a source of glucose, which involves the process of gluconeogenesis. The graph showing the ways, by which the human body cells shift in their rate of glucose oxidation and the source of glucose oxidized after food intake has stopped is given below:
Explanation of Solution
When the food intake stops for a long time, then gradually the reserve glycogen that was used as the source of glucose declines. Then, the liver along with the kidneys produce glucose by using other molecules. These molecules include glucogenic amino acids, lactate, and glycerol. This process of producing glucose by using other molecules is known as gluconeogenesis.
The liver also uses some other sugars, such as sucrose and galactose as a source of glucose. The liver produces
Therefore, it can be concluded that the human body uses other molecules as a source of glucose to fulfill the need for glucose in its organs. This process is known as gluconeogenesis.
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Chapter 9 Solutions
Life: The Science of Biology
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