Need some help with science project

So I'm doing a flap book for my science project. I need to draw a picture for "Stable Internal Conditions" or "Homeostasis"?
What picture should I draw?
I would appreciate some help, thanks!

Draw a capillary (blood vessel) and next to it draw several cells. The space surrounding the cells label interstitial fluid. There must remain homeostasis between the blood, interstitial fluid, and inside the cells.

With picture only letter writing is more valuable,welcome.