Unit 4: Continuity and Change
Topic 4.9: Homeostasis Questions
Practice 20 exam-style questions for IB Biology Topic 4.9. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1Identify1 mark
Which part of the brain acts as the control centre that adjusts the breathing rate?
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Why does a build-up of carbon dioxide in the blood make the blood pH fall?
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Human core body temperature begins to fall below normal in cold conditions.
Which response helps restore the set point?
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Which of these is a function of the pancreas in blood glucose regulation?
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State the approximate value at which the blood pH is normally held (the set point).
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State one function of the pancreas in the regulation of blood glucose concentration.
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In negative feedback, how does the body's response relate to the original change in a blood variable?
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State the structure (gland or tissue) that secretes the hormone ghrelin.
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State what is meant by the term homeostasis.
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Which hormone INCREASES appetite, in contrast to the hormones that decrease it?
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Which structure acts as the control centre that detects changes in core body temperature and coordinates the response?
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Which hormone is secreted by the lining of the empty stomach and stimulates appetite before a meal?
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State the type of feedback that controls human core body temperature.
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Identify two hormones that help control appetite and, for each, name the structure that secretes it.
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On which region of the brain do the appetite-control hormones act to adjust hunger?
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A person's core body temperature rises above normal on a hot day.
Which response helps cool the body back to the set point?
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Which type of feedback is responsible for keeping blood glucose, body temperature and blood pH within narrow limits?
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What is meant by the 'set point' of a blood variable in homeostasis?
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Which hormone is released when blood glucose rises above its normal level after a meal?
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Which structures detect a fall in blood pH and trigger a change in breathing?
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