Write one important role of the following :

1. Cerebellum
2. Medulla oblongata
3. Parasympathetic nervous system

1. Cerebellum — The main function of Cerebellum is to balance the body and coordinate muscular activities.

2. Medulla oblongata — Medulla oblongata controls the activities of the internal organs.

3. Parasympathetic nervous system — The parasympathetic nervous system re-establishes the normal conditions of the body after a fight or flight response. For example, if sympathetic nervous system increases the heart rate, parasympathetic nervous system relaxes it.