Question

which part of brain controls involuntary actions. write functions of any two regions of brain

Answer 1

The Involuntary actions of the body such as breathing, heart beat, etc are controlled by a part of the brain called the Medulla oblongata. It is a relief for man since involuntary actions are perhaps what keep us alive and we don't need to think about it.
Other parts of the brain with their functions include:

1: Cerebrum: Which helps us to think, plan and understand things
2: Cerebellum: This part controls the muscular movements of the body