3.5 million people and about 40% are not
treated
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A nervous system can be defined as an organized group of cells, called neurons, specialized for the conduction of an impulse. Compared to the Endocrine regulation, which is a system of sensing elements possessing the means to detect a need for both increased and decreased secretion.
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Paranasal sinuses are a group of four paired air-filled spaces that surround the nasal cavity. The maxillary sinuses are located under the eyes, the frontal sinuses above the eyes, the ethmoidal sinuses between the eyes, and the sphenoidal sinuses are behind the eyes. hope this helps!
