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Danh ngôn của August Krogh (Sứ mệnh: 4)

In the numerous observations made in my laboratory upon this object, we have only once seen a combination of vessels in which there might be a direct communication between a small artery and a vein, though the two observers could not come to a final conclusion on the point.
In man, the mechanical breathing is essential to life, and it is one of the old tests for death to see whether these movements have ceased completely.