First Principles
NovelToon

Episode 23

How is respiration effected? You ask -- why does air periodically rush intothe lungs? The answer is that influx of air is caused by an enlargement ofthe thoracic cavity, due, partly to depression of the diaphragm, partly tomotion of the ribs. But how can these bony hoops move, and how does motionof ...

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First Principles

Episode 23

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