Oh! This is an ideal lab—cheap and instructive! Keep the Patient Alive! is a homeostasis lab. If you use Apologia Biology, the term, homeostasis, is in Module 1. The lab involves keeping 200 mL of water at body temperature, plus or minus four degrees. (Instead of a hot plate, you could keep a container of ice and an electric kettle available.) Feel free to do this experiment in a pan on the stove.
Here is a popular lab called Homer-ostasis, featuring Homer Simpson. I like the lab idea because the patient is leaking and turning different shades of yellow, as though he were jaundiced; however MANY people object to The Simpsons.
What are we going to do? My kids will get a stack of yogurt cups, thermometers, water, ice, and an electric kettle. The goal is to keep the water temperature at 37 degrees Celcius (+ or - 4 degrees) for five minutes—without any other instructions. Yes, the kids may name the patient and draw cartoons on the cups. This is a good time to talk about experimental design, too!
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