Four primary regions are the brainstem, the cerebellum, the cerebrum, and the cerebral cortex. Each brain region is responsible for a variety of functions, and injury to any of these regions impairs specific functions.
Cellular respiration is a pathway that organisms use to generate energy. Oxygen is required and is used to break down nutrients, like glucose sugar. The nutrients are broken down to generate ATP (energy) and carbon dioxide and water (waste). Organisms from all kingdoms of life can use cellular respiration including bacteria, archaea, plants, protists, animals, and fungi.
1 Both the processes are performed by endosymbiotic organisms that lived inside all eukaryotic cells (cells with a nucleus proper), mitochondria were really Rickettisiae performing cellular respiration and chloroplasts were actually cyanobacteria living within the cells converting sun light into sugar all the time.