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QLDBiologyQuick questions
Unit 2: Maintaining the internal environment
Quick questions on Homeostasis and negative feedback control (QCE Biology Unit 2)
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the five components of a feedback loop?Show answer
Every homeostatic control loop contains the same five components in the same order.
What is negative feedback?Show answer
In a negative feedback loop, the response opposes the change that triggered it.
What is positive feedback?Show answer
In positive feedback, the response amplifies the change. The variable accelerates away from the starting value until an external event terminates the loop. It is rare in physiology because it is unstable, and is reserved for processes that need to go to completion.
What is q1?Show answer
Define homeostasis and identify the five components of a negative-feedback loop using body temperature as the example. [4 marks]
What is q2?Show answer
A continuous blood-glucose monitor on a type 2 diabetic shows readings 5.5, 5.8, 6.2, 9.0, 11.0, 8.5, 6.8 and 5.6 mmol/L across two hours after lunch. Identify the homeostatic disturbance and explain why the rise is slower to correct than in a healthy person. [3 marks]
What is q3?Show answer
Compare negative and positive feedback. (a) Define each. (b) Give one example of positive feedback in childbirth.
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