The part of brain which controls the involuntary actions such as heart beat, breathing, blood pressure, etc. is:(a) pons (b) medulla (c) cerebrum (d) cerebellum

(b) medulla.

The medulla oblongata connects the brain to the spinal cord and controls various involuntary action such as the heartbeat, breathing, blood pressure and the peristaltic movement in the body.

Note:- Image is posted for explanation purpose only.