The regulation of homeostasis and similar functions by the nervous system and immune system acting together

That regulates

A person or organisation that is subject to regulation

plural of regulatee

(set theory) One of the axioms in axiomatic set theory, equivalent to the statement that every non-empty set contains a member that is disjoint from that set.

(graph theory) A graph whose vertices all have the same degree.

(computer science) A formal language that can be expressed using a regular expression or finite-state machine.

(law) legislation or other binding provisions

The state, quality, or condition of being regulatory.

(algebra) An element of a ring that is not a zero divisor.