Biology Systems: body systems

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I'm learning "Biology Systems: body systems" on The Future Market. Lesson 1: "Homeostasis: how the body keeps its balance".

What the lesson teaches:
- Homeostasis is the body keeping its inside conditions within a normal range. The body keeps watching those conditions and fixes them when they drift (OpenStax).
- Set point: the value around which the normal range moves. For body temperature the set point is about 37 degrees C (98.6 degrees F).
- Negative feedback reverses a change and brings the value back toward the set point. Most of the body's control works this way.
- Change - The body's response
- Temperature rises above 37 degrees C - Skin blood vessels widen, you sweat, you breathe faster
- You are exposed to cold - The body saves heat and makes more heat
- Blood glucose rises - The pancreas releases insulin, and muscle, fat and liver cells take up glucose

The exercise I'm working on:
Draw one negative feedback loop of your own choice (for example, shivering when cold, or blinking when dust touches your eye) with sensor, control centre and effector labelled. Then name one positive feedback loop from the lesson and say how it ends.

I'm stuck. Please:
1. Explain the main idea in plain, simple words with one everyday example.
2. Walk me through the exercise one small step at a time. Ask me what I've done so far before giving the next step.
3. Don't just give me the final answer. Help me do it myself, and check my work when I share it.

I'm a parent helping my child (about 8 years old) with a lesson called "Homeostasis: how the body keeps its balance" from the course "Biology Systems: body systems".

Here's what the lesson says:
Your body is like a house with a thermostat. When the house gets too hot, the air conditioner comes on. When it gets too cold, the heater comes on. Your body does the same thing with its temperature, its sugar and many other things, all day and all night.

The activity:
Draw one negative feedback loop of your own choice (for example, shivering when cold, or blinking when dust touches your eye) with sensor, control centre and effector labelled. Then name one positive feedback loop from the lesson and say how it ends.

Please explain this so an 8-year-old understands: short sentences, a fun everyday example, and no hard words.
Then give me 3 simple questions I can ask my child to check they understood, and a way to do the activity together, one tiny step at a time.