Homeostasis and ResponseAQA GCSE Biology (8461)

Homeostasis

Work through the notes, try the practice questions, then take the quiz. The report tells you exactly what to revise next. (2026)

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1
Which of the following is the AQA definition of homeostasis?
Answer & explanation
Correct: option B
Homeostasis = regulation of internal conditions in response to internal/external changes.
2
Which of these are the THREE components of a control system?
Answer & explanation
Correct: option B
Always three components: receptors detect, coordination centres process, effectors respond.
3
An effector is always a:
Answer & explanation
Correct: option C
Effectors carry out the response. They are muscles (which contract) or glands (which secrete).
4
Negative feedback means:
Answer & explanation
Correct: option A
Negative feedback = opposite response, restoring the set point. It is the basis of homeostasis.
5
Compared with nervous communication, hormonal communication is generally:
Answer & explanation
Correct: option B
Hormones travel via the bloodstream, so they take seconds-to-minutes. But their effects often last hours, much longer than a nervous impulse.