The best replacement for homeostasis is allostasis.

The best alternatives to homeostasis are rated as following:

★★★★★	allostasis
★★★★	equilibrium
★★★★	steady state
★★★	internal balance
★★	hemostasis
★★	bodily equilibrium
★★	metabolism
★	heterostasis
★	homeodynamics
	homoeostasis
	homeostatic
	enantiostasis

Your alternative for homeostasis is not listed? Suggest!

Speaking about homeostasis, one probably shouldn't forget about respiratory system.

Other search terms related to homeostasis and their ratings are:

★★★★★	respiratory system
★★★★★	nervous system
★★★★	digestive system
★★★★	circulatory system
★★★★	skeletal system
★	endocrine system
★	negative feedback

You have in mind a companion for homeostasis and it is not yet here? Propose!

Google Trends

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homeostasis

allostasis

equilibrium