The book Essentials of Human Physiology was written by author Diarmid Nol Paton Here you can read free online of Essentials of Human Physiology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Essentials of Human Physiology a good or bad book?
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The heart lies in the thorax surrounded by the elastic lungs. As it contracts and dilates it must alternately pull upon and compress the lungs, and thus tend to cause an inrush and an outrush of air the cardio-pneumatic movement. If a simultaneous tracing of the heart-beat and of the movements of the air column be taken, it will be seen that at the beginning of ventricular systole there is a slight out- rush of air from the lungs, probably caused by the blow given to the lungs by the suddenness... of the systolic movement. This is followed by a marked inrush of air corresponding to the outflow of blood from the ventricles, and caused by the fact that the contracting ventricles draw on and expand the 298 HUMAN PHYSIOLOGY lungs. This is followed by a slower outrush of air corre- sponding to the active filling of the ventricles during the beginning of ventricular diastole. Lastly, during the period of passive diastole, the cardio- pneumatic movements of air are in abeyance. These cardio-pneumatic move- ments are of great importance in animals which hibernate.
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