This Grade 12 worksheet helps students understand homeostasis and feedback mechanisms.
Students will complete fill-in-the-blank questions covering negative feedback, positive feedback, and body regulation.
Homeostasis and Feedback Mechanisms — Practice
0 / 6
Try these before or after you print the worksheet. The printable asks you to fill in the words. This asks you to follow a feedback loop round and to tell negative from positive — negative does not mean bad, which is the thing that trips everyone up.
Question 1 — put them in order
You get too hot. Click the steps of the feedback loop in order.
Stimulus → receptors → control centre → response. Every feedback loop has these four parts, whatever is being regulated.
Question 2
What does negative feedback do?
Reverses the change.Negative here means opposing, not bad — it is what keeps you stable, and it is by far the more common of the two.
Question 3
Which of these is an example of negative feedback?
Sweating. You get hot, you sweat, you cool down — the response cancels the change. The other three all amplify, which makes them positive feedback.
Question 4
What do receptors do in a feedback loop?
Detect. The control centre decides and the effectors act — keeping the three roles apart is most of understanding the loop.
Question 5
What is homeostasis?
Stable inside, whatever happens outside. Your body holds its temperature near 37°C whether the room is freezing or hot.
Question 6 — select all that apply
Select every part of a feedback loop, then press Check.
Stimulus, receptors and a control centre — plus the response. Mutations, chromosomes and plasmids belong to genetics, not to regulation.
Think about it
Negative feedback keeps things stable. Why would a body need positive feedback at all?
Sweating cools you down. What does your body do when you are too cold?
Receptors detect, the control centre decides, effectors act. Can you name the equivalent parts in a thermostat?
Why is a stable internal temperature worth all this machinery?