A fourteen year old female is required to take an oral glucose tolerance test in order to determineif she has diabetes. As part of the test, she is required to fast overnight for at least eight hours. Inthis time, she cannot consume any food or caffeinated drinks but can consume water.a) Explain the homeostatic mechanism that operates in response to her fasting
Question
A fourteen year old female is required to take an oral glucose tolerance test in order to determineif she has diabetes. As part of the test, she is required to fast overnight for at least eight hours. Inthis time, she cannot consume any food or caffeinated drinks but can consume water.a) Explain the homeostatic mechanism that operates in response to her fasting
Solution
When the fourteen-year-old female fasts overnight for the glucose tolerance test, her body will respond through a homeostatic mechanism to maintain a balance of glucose in her blood.
Step 1: As she stops eating, her blood glucose levels will start to drop.
Step 2: This drop in blood glucose is detected by the alpha cells in the pancreas.
Step 3: In response, the alpha cells secrete the hormone glucagon.
Step 4: Glucagon signals the liver to convert stored glycogen into glucose.
Step 5: This newly formed glucose is then released into the bloodstream, which helps to raise blood glucose levels back to a normal range.
Step 6: As the blood glucose levels rise, the secretion of glucagon is inhibited, thus stopping the conversion of glycogen to glucose.
Step 7: If she drinks water, it will not affect this process as water does not contain any glucose or calories.
This is the homeostatic mechanism that operates in response to her fasting. It ensures that her body maintains a stable blood glucose level, even in the absence of food intake.
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