Seven Lectures On the Philosophy of Life And the Art of Preserving Health
Seven Lectures On the Philosophy of Life And the Art of Preserving Health
C W Cloye W Gleason
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During respiration, the anterior ends of the ribs are raised up by the action of the intercostal muscles, and at the same time the central portion of the diaphragm drops down to the extent of about three inches, caus- ing the air to rush in through the air-tube, distending all of the little air-cells in the lungs to their utmost capacity. The right lower chamber of the heart then contracts, and forces the black, impure and venous blood out into the small net-work of blood vessels on the outside... surface of the air-cells, when it throws off its black material or carbonic acid gas into the air-cells, and at the same time absorbs the oxygen of the atmos- pheric air, instantaneously changing its color from the darkest venous hue to the brightest scarlet red. The aggregate extent of surface afforded by these numer- ous, air-cells for the purification of the blood, is said to exceed twenty thousand square inches ! Over this vast surface, all of the blood which is contained in the human body passes every two minutes and twenty-eight seconds, and is completely cleansed and purified, and has " breathed into it the breath of life, " which renders it warm and stimulating to all of the different organs of the human body !
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