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In humans and other mammals, the anatomy of a typical respiratory system is the respiratory tract.The tract is divided into an upper and a lower respiratory tract.The upper tract includes the nose, nasal cavities, sinuses, pharynx and the part of the larynx above the vocal folds.
The episode begins with an introductory monologue based closely on the opening of the source novel, after which the program takes on the format of an evening of typical radio programming being periodically interrupted by news bulletins.
where (+) is notation for a binomial coefficient.It represents the number of distinct pairs that can be selected from n + 1 objects, and it is read aloud as "n plus one choose two".