autoregulation

The automatic adjustment of blood flow to a particular body region in response to its current requirements. See also shunting.

1. The tendency of the blood flow toward an organ or part to remain at or return to the same level despite changes in arterial pressure.
2. A biological system equipped with inhibitory feedback systems such that a given change tends to be largely or completely counteracted.

The noun has one meaning:

Meaning #1: (physiology) processes that maintain a generally constant physiological state in a cell or organism