Review.  1 Professor Hofstadter has written a superb book ... The Age of Reform entitles Hofstadter to rank with C. Vann Woodward as a master of creative synthesis, as an interpreter of the past who can add to cold data an emphatic insight that transforms history from a book of the dead into a chronicle of life.-- American Political Science Review.
Ventilation systems. All multicellular organisms have mechanisms for drawing oxygen-rich air (or water) into their bodies and removing carbon dioxide-rich air (or water).A closer look at insect breathing systems makes it easier to appreciate the functions of the more familiar human ventilation system.entilation systems. All multicellular organisms have mechanisms for drawing oxygen-rich air (or water) into their bodies and removing carbon dioxide-rich air (or water).
1 Oxygen then diffuses into the cells, and carbon dioxide enters the blood. 2  The blood then circulates back to the lung, where the process begins again. 3  Definition of Ventilation Ventilation is the process of moving gases through the respiratory tract. In other words, oxygen diffuses towards the blood and is taken up by hemoglobin, and carbon dioxide diffuses towards the alveolus and mixes with the air. 2  No âactive processâ is involved. 3  Oxygen simply diffuses through the membrane and plasma, and is taken up by the red blood cells.