Why do parents and doctors get worried if a child gets a head or a spinal injury

parents and doctors get very worried if a child gets a head or spinal injury because the spinal cord supports the whole body. So, if any damage is done than the child may become disable. Its the same case with a head injury. Brain cells cannot reproduce, so if there is any damage done it is permanent.

Explanation:

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.