(i) If the cerebellum is not functioning properly, what activities of our body would get affected?

(i) If the cerebellum is not functioning properly, what activities of our body would get affected?
(ii) Which part of brain controls involuntary actions?

(i) Cerebellum controls the voluntary action of our body. So, if it is not functioning properly, voluntary actions of our body like maintaining the posture, balance, etc., will be affected.
(ii) Medulla oblongata controls the involuntary actions.