What is glucagon and its role in the body?
AP Biology Unit 4 Review: Cell Communication & Cycling

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Biology
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9th - 12th Grade
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Hard
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1.
FLASHCARD QUESTION
Front
Back
Glucagon is a hormone produced by the pancreas that promotes the breakdown of glycogen into glucose, increasing blood sugar levels, especially during low energy states.
2.
FLASHCARD QUESTION
Front
What triggers the release of glucagon?
Back
Low cellular ATP concentration triggers the release of glucagon, indicating that the body needs more energy.
3.
FLASHCARD QUESTION
Front
Define positive feedback in biological systems.
Back
Positive feedback is a process that amplifies a response or increases the output in a system, often leading to a specific outcome, such as the release of more hormones.
4.
FLASHCARD QUESTION
Front
Give an example of positive feedback in the human body.
Back
An example of positive feedback is the release of inflammatory cytokines by immune cells, which enhances the immune response.
5.
FLASHCARD QUESTION
Front
What is a negative feedback loop?
Back
A negative feedback loop is a control mechanism that counteracts changes in a system, helping to maintain homeostasis.
6.
FLASHCARD QUESTION
Front
How do mammals maintain a constant body temperature?
Back
Mammals use negative feedback loops to maintain a constant body temperature, adjusting physiological processes to counteract deviations.
7.
FLASHCARD QUESTION
Front
What occurs after metaphase in mitosis?
Back
After metaphase, the next phase in mitosis is anaphase, where sister chromatids are pulled apart to opposite poles of the cell.
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