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Questions and Answers
Which of the following components is NOT required for homeostasis?
Positive feedback loops help to maintain homeostasis.
False
What is homeostasis?
The maintenance of a stable internal environment within an organism.
In a negative feedback loop, the response of the effector __________ the stimulus.
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Which of the following best describes the role of the control centre in homeostasis?
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Match the following terms with their definitions:
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An air-conditioning system is an example of a positive feedback loop.
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What happens when homeostasis is disturbed?
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What is the primary role of insulin in blood glucose regulation?
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The brain acts as a control center during thermoregulation.
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What is the effector in the process of blood clotting?
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The liver breaks down glycogen when blood glucose levels are __________.
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What type of feedback mechanism is used during childbirth?
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Glucose receptors are found in the pancreas.
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Match the following components to their corresponding biological processes:
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The __________ system is responsible for extrinsic regulation in the body.
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Study Notes
Homeostasis
- Definition: A stable internal environment maintained by all body systems working together.
- Components necessary for homeostasis:
- Receptor: Monitors physiological conditions and detects changes.
- Control Centre: Processes information from receptors and directs appropriate responses.
- Effector: Executes commands from the control centre to restore balance.
Feedback Loops
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Negative Feedback Loop:
- Response reduces or stops the initial stimulus.
- Restores normal range and brings the body back to homeostasis.
- Example: Air-conditioning system adjusts temperature based on sensor feedback.
-
Positive Feedback Loop:
- Response amplifies the initial stimulus, moving the body away from homeostasis.
- Generally used in situations requiring a quick and decisive change.
- Examples:
- Labor during childbirth; accelerates contractions until delivery.
- Blood clotting; accelerates until a clot is formed.
Regulation of Homeostasis
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Thermoregulation:
- Monitors and regulates body temperature.
- Receptors detect heat, control centre (hypothalamus) integrates the information, and effectors (blood vessels, sweat glands) enact physical changes.
-
Blood Glucose Regulation:
- High glucose levels trigger insulin release from the pancreas, lowering blood sugar.
- Low glucose levels trigger glucagon release, which raises blood sugar by breaking down glycogen in the liver.
Types of Regulation
-
Intrinsic (Autoregulation):
- Automatic responses within cells, tissues, or organs to local environmental changes.
-
Extrinsic Regulation:
- Responses guided by the nervous and endocrine systems to broader systemic changes.
Importance of Homeostasis
- Essential for survival; when homeostasis is disrupted, illness may occur.
- Maintains optimal levels of chemicals, temperature, and pressure essential for cell survival.
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Description
Explore the critical concepts of homeostasis, including the roles of receptors, control centers, and effectors. Understand the differences between negative and positive feedback loops and their significance in maintaining physiological balance in the body.
