THINKING FOUNDATIONS
Systems thinking
Name the parts, how they affect each other, what goes in and out, and where a change comes back. Look for delays and for effects nobody intended. Use this when the question is about a whole response, not a single isolated fact.
1. Everyday example
Everyday: a room thermostat
The sensor, the heater and the room are parts. Heat is an output. The sensor feeds back: when the room is hot enough the heater switches off. There is a delay, so the room overshoots. Opening a window is an unintended extra output. Listing “there is a heater” is not systems thinking.
2. A level example
A level: a rise in body temperature
Start with the same change throughout this page: body temperature rises. Thermoreceptors detect that rise, the hypothalamus coordinates, and sweat glands and skin arterioles increase heat loss. The new, lower temperature is detected again. That return is the feedback. A list of the parts, with no arrows, is not yet the system.
One rise, followed through the loop
Body temperature rises. Select a part to see how that change travels. The arrows are the relationships. The return arrow is negative feedback.
Input. Body temperature has risen. This is the change that enters the system. The same rise is used in the introduction and in this loop.
3. Show me
Show me. Follow one rise in body temperature through the loop, including the return.
- Body temperature rises above the set point.
Following the sequence is practice. It is not recorded as mastery.
4. Guide me
Practice question
Guide me. A question asks why a hormone response can overshoot. Which idea belongs to systems thinking?
5. Let me try
Independent transfer. My Progress records this only when the reasoning holds.
Practice question
Let me try. A new scenario: blood glucose rises after a meal. Use the loop. All four parts must hold before this module is recorded as solved.
Practice question
Complete the missing feedback connection. Glucose rises, insulin is released, and cells take glucose up. What closes the negative-feedback loop?
Practice question
The cells that detect blood glucose stop responding. What changes in the system?
Practice question
Glucose has fallen back toward the set point. Why does insulin release diminish?
Practice question
Repair this chain: “Glucose rises, so glycogen breaks down, so insulin is released, so blood glucose rises further.”
0 of 4 parts hold so far. The module is solved only when every part holds.