Year 9 Science · Unit 1 · Lesson 2
Challenge Worksheet
Learning Goals
What if…?
Scenario
A person working outdoors on a very hot afternoon has no access to water or shade. At first they sweat heavily and their core temperature holds near 37 °C. After some hours they run short of water, the sweating slows and then stops, and their core temperature begins to climb past 39 °C towards 40 °C.
Trace what has happened using the five parts of the loop. Identify which part stops working and which parts are still working normally, then explain why the temperature now rises rather than being corrected. Finish by explaining why the danger grows the higher the temperature climbs and the longer it stays there, and why cooling the person down is the treatment. Use the terms stimulus, receptor, effector and enzyme in your answer.
1. A person with type 1 diabetes injects insulin before a meal. Explain which part of the glucose loop has failed, which parts are undamaged, and why the injection helps without being a cure. Then explain what this tells you about why the injections have to be repeated.
2. A shivering person and a person with untreated type 1 diabetes both have an internal condition away from its set point, but only one of them is ill. Construct an argument for why the measured reading cannot settle which is which, and state what a doctor would need to know instead. Lesson 15 returns to this idea for non-infectious disease.
Wrap Up
In one sentence, what was the main idea of this lesson?