Most common causes of lower motor neuron injuries are trauma to peripheral nerves that serve the axons -- a virus that selectively attacks ventral horn cells. Disuse atrophy of the muscle occurs i.e., shrinkage of muscle fibre finally replaced by fibrous tissue (fibrous muscle) Other causes include Guillain--Barre syndrome, C. botulism, polio, and cauda equina syndrome; another common cause of lower motor neuron degeneration is amyotrophic lateral sclerosis.
is guillain barre syndrome a lower motor neuron disease?
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Answer: yes

Oxygen toxicity is a condition resulting from the harmful effects of breathing molecular oxygen (O ) at increased partial pressures. It is also known as oxygen toxicity syndrome, oxygen intoxication, and oxygen poisoning. Historically, the central nervous system condition was called the Paul Bert effect, and the pulmonary condition the Lorrain Smith effect, after the researchers who pioneered its discovery and description in the late 19th century. Severe cases can result in cell damage and death, with effects most often seen in the central nervous system, lungs and eyes. Oxygen toxicity is a concern for underwater divers, those on high concentrations of supplemental oxygen (particularly premature babies), and those undergoing hyperbaric oxygen therapy.
can you have too much oxygen in your lungs?
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Answer: yes

As soon as they realize that Joetta is safe, the Watsons decide to immediately return home to Flint, trying to avoid explaining the full implications of what has happened to the children. Kenny is unable to process the events in Birmingham and avoids his family and friends over the ensuing weeks, instead spending many hours hiding behind the sofa. Byron eventually coaxes him out and gets Kenny to talk about what happened, which finally brings a flood of tears from Kenny. Encouraging his little brother to ''keep on stepping'', Byron explains that although the world is not perfect, he has to keep moving on.
does joey die in the watsons go to birmingham?
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Answer:
no