In a sense yes but not as a living organism would. The thermostat regulates the temperature of the coolant in the engine. The ECU regulates the fuel/air mixture and the timing of the engine. All the other sensors send signals to the ECU which controls emissions and how the engine performs. The transmission regulates when the transmission changes gears, so in a sense the answer would be yes.

if your refering to an ECU it is the central control center for your car. it regulates speed, temperature of different thigs like oil--it does every thing you dont do your self. like shifting gears in an automatic transmission.

What about the ecu?

ecu?

The thermostat regulates the temperature in the home.