Energy releasing reactions need to take place so we can function. Without energy we can not move around. A great source of energy is food and plenty of water.
The answer would be medulla oblongata
Medulla is the lowest part of the brain stem which has a role autonomous nervous system. Medulla is important to sustain life as it controls the blood pressure(vasomotor), respiratory system and cardiovascular system. It also controls many reflexes that related to cranial nerves like gagging reflex.
O A. Cytokinesis
Hope this helps!
