This tool asks you to build a control loop in the correct order. You pick one of three processes, fill five steps from a list of seven options, and press check. The list has the five correct steps plus two distractors that do not belong.
The feedback names what is right, what is in the wrong place and what does not belong, then draws your loop as a diagram.
How do I use it?
- Choose a process: body temperature control (too hot), blood glucose after a meal (a learning model), or water content (blood too concentrated).
- Fill steps 1 to 5 using the drop-downs. The seven options appear in a mixed order in every box.
- Use each step only once. If you repeat one, the tool asks you to remove it.
- Press Check my mechanism. Press Reset to start again.
You must choose something for all five positions before the check will run.
Example walk-through
Take body temperature control. A correct loop runs: temperature rises above the set point, receptors detect the rise, the brain sends signals to effectors, sweating increases and skin blood vessels widen, and heat loss increases so temperature falls back.
Suppose you choose “shivering starts and skin blood vessels narrow” for step 4. The tool marks it as not part of this loop and explains that the response warms the body further, so it adds to the deviation instead of countering it.
Suppose you swap steps 2 and 3. Both are real steps, but the tool says each is in the wrong place and gives the position it belongs in, because the brain cannot respond before a receptor has detected anything.
When all five steps are right, the score reads 5 of 5. The diagram shows the chain with arrows and a return to the start, and the tool states that the response counters the deviation.
How do I read the result?
- Score line: how many of the five positions are correct.
- Step-by-step notes: “correct” with a reason, “wrong place” with the right position, or “not part of this loop”.
- Mechanism diagram: your own order drawn as boxes with arrows, so you can see the chain you chose.
- Final explanation: shown only when all five are right. It restates why the loop is negative feedback.
What are the limits?
The three loops are simplified for learning. The glucose loop is a school-level model, and real regulation involves more detail than the five steps shown.
The tool gives no diagnosis and no personal glucose or health estimate. For any question about a real person’s health, speak to a doctor. Check your syllabus wording on the Cambridge subject page for the depth your course expects.
Which lessons explain the output?
Read interpreting a negative-feedback loop first, then explaining temperature regulation using competing effects and reading a glucose-regulation diagram without diagnostic claims.
The wider topic is excretion and homeostasis, with a mixed practice set. Loop thinking also helps in tracing a reflex pathway. The tools page lists the rest of the set.
When you can order the loop but still struggle to write it in full sentences, our team can work on that with you. See online one-to-one Biology tuition.