Homeostasis and feedback loops

What is the primary goal of homeostasis in the human body?

• To maintain a constant external body temperature.

• To ensure all body systems work independently.

• To maintain a stable internal environment.

• To increase metabolic rate for energy production.

What is the key difference between an ectotherm and an endotherm?

• Ectotherms can only survive in cold environments, while endotherms can survive in hot environments.

• Ectotherms regulate their body temperature internally, while endotherms rely on external sources.

• Endotherms maintain a stable internal body temperature, while ectotherms' body temperature fluctuates with the environment.

• Endotherms are typically smaller than ectotherms.

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Which of the following best describes a negative feedback loop?

• A response that amplifies the initial stimulus.

• A response that counteracts a change to maintain a set point.

• A process that leads to a continuous increase in a variable.

• A system where the output has no effect on the input.

Which of the following is an example of a positive feedback loop in the human body?

• Regulation of blood glucose levels.

• Maintaining a stable internal body temperature.

• Childbirth contractions.

• Maintaining blood pH within a narrow range.