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Questions and Answers
What is the body's ability to maintain a stable internal environment despite external changes?
Which hormone signals cells to absorb glucose from the bloodstream to lower blood sugar levels?
What type of regulatory mechanism in homeostasis reverses a change to maintain internal stability?
What occurs when glucagon signals the liver to release stored glucose into the bloodstream?
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Which feedback mechanism initiates processes that reverse a change to maintain internal stability?
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How does the body cool down when the body temperature rises above normal during exercise?
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What happens in blood glucose regulation after eating?
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How does positive feedback in homeostasis differ from negative feedback?
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What initiates positive feedback during childbirth?
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What triggers blood clotting when a blood vessel is damaged?
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Study Notes
Homeostasis
- Homeostasis is the body's ability to maintain a stable internal environment despite external changes.
- Examples of homeostasis include:
- Regulating body temperature by sweating when hot and shivering when cold
- Maintaining steady blood sugar levels
Regulation of Blood Sugar Levels
- When blood sugar levels rise after a meal, insulin is released to signal cells to absorb glucose from the bloodstream
- When blood sugar levels drop, glucagon is released to signal the liver to release stored glucose into the bloodstream
Types of Feedback Mechanisms in Homeostasis
- Negative Feedback
- Positive Feedback
Negative Feedback
- A regulatory mechanism in homeostasis where the body responds to a change by initiating processes that reverse the change, maintaining internal stability
- Examples:
- Body temperature regulation: sweat glands produce sweat to cool down when body temperature rises
- Blood glucose regulation: insulin and glucagon work together to maintain stable blood sugar levels
Positive Feedback in Homeostasis
- A process where the body responds to a stimulus by amplifying the change, rather than reversing it to maintain stability
- Examples:
- Childbirth: oxytocin release causes uterine contractions, which stimulate further oxytocin release, leading to stronger contractions
- Blood clotting: platelets adhere to the site of injury, releasing chemicals that attract more platelets, forming a plug and eventually a blood clot
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Description
Test your knowledge on the feedback mechanism involved in maintaining Homeostasis. Understand how the body regulates internal conditions despite external changes, such as temperature or blood sugar levels.
