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Negative Feedback Systems Worksheet

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Negative Feedback Systems Worksheet

Negative feedback helps the body keep internal conditions within healthy limits. Read the information and answer all 11 questions.

The basic idea

Homeostasis is the maintenance of a relatively stable internal environment. Negative feedback detects a change away from a normal level and triggers responses that oppose that change.

1.What does negative feedback do when an internal condition moves away from its normal level?

It makes the change larger.
It triggers a response that reduces the change.
It permanently switches off the body system.
It changes every body condition at once.

2.Complete the sentence: Homeostasis keeps the body’s internal conditions relatively .

3.Complete the sentence: Negative feedback helps changes away from normal.

4.Put these stages in the order they usually happen: effector acts; receptor detects a change; response reduces the change; control centre coordinates a response.

Sophie at the aquarium

Sophie is helping at an aquarium. After carrying a heavy bucket across the warm tropical fish room, she feels hot. Sensors in her skin and inside her body detect that her temperature is above its usual level. The brain coordinates responses: sweat glands release sweat, and skin blood vessels widen. As sweat evaporates and more heat leaves the skin, her temperature moves back towards its usual level.

5.In Sophie’s situation, what is the stimulus—the initial change that starts the feedback process?

6.Name one receptor, the control centre, and one effector involved in Sophie’s temperature response.

7.Explain how sweating helps bring Sophie’s temperature back towards normal. Use the words “effector” and “response”.

8.True or false? Sophie’s temperature rising during activity proves that negative feedback has failed. Explain your choice.

Other examples and reasoning

Negative feedback also helps regulate blood glucose. After a meal, blood glucose rises. The pancreas detects the change and releases insulin. Body cells take up more glucose, and the liver stores some glucose, so the blood glucose level falls towards its usual range.

9.In blood glucose control after a meal, identify the change, the control centre, and one way the response reduces that change.

10.Oliver says, “Negative feedback means the body always keeps exactly the same temperature.” Is he correct? Explain what is misleading about his statement.

11.Imagine that a person’s sweating response did not work properly on a hot day. Predict what could happen to their body temperature and explain why.