Biology: Homeostasis and Feedback 10-Q Review

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What is homeostasis?

Back

Homeostasis is the process by which living organisms maintain a stable internal environment despite changes in external conditions.

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What is a feedback loop?

Back

A feedback loop is a biological mechanism in which the output of a system influences its own operation, often to maintain homeostasis.

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What is positive feedback?

Back

Positive feedback is a process that amplifies a response or increases the output in a system, often leading to a specific outcome.

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What is negative feedback?

Back

Negative feedback is a process that counteracts a change in a system, helping to maintain stability and homeostasis.

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What is an example of a positive feedback loop in biology?

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An example of a positive feedback loop is the process of childbirth, where the release of oxytocin increases contractions, leading to more oxytocin release.

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What is selective permeability in cell membranes?

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Selective permeability is the property of cell membranes that allows certain molecules to pass through while blocking others.

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How do blood vessels react when the body is too hot?

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When the body is too hot, blood vessels dilate, allowing more blood to flow to the skin, which helps to cool the body down.

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What happens to capillaries when the body is cold?

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When the body is cold, capillaries constrict (narrow), reducing blood flow to the skin to conserve heat.

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What role do hormones play in feedback mechanisms?

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Hormones act as signaling molecules that regulate physiological processes and can initiate feedback loops in the body.

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What is thermoregulation?

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Thermoregulation is the process by which the body maintains its internal temperature within a certain range, despite external temperature changes.