. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. 172 ELEMENTS OF BIOLOGY carbon dioxide from, the blood. The fundamental processes of respi- ration whereby energy is transformed occur in the tissue cells of the entire body. While at rest the demand of the body cells for oxygen and their output of carbon dioxide are fairly constant. But with HYOID BONE fVfiiwj^v^ TRACHEA. EPIGLOTTIS LARYNX- LEFT PLEURA CA VITY \ BRONCHI ALVEOLI DIAPHRAGM Fig. 115.—Diagrammatic representation of the human respiratory system. The wall of the thorax has been re
. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. 172 ELEMENTS OF BIOLOGY carbon dioxide from, the blood. The fundamental processes of respi- ration whereby energy is transformed occur in the tissue cells of the entire body. While at rest the demand of the body cells for oxygen and their output of carbon dioxide are fairly constant. But with HYOID BONE fVfiiwj^v^ TRACHEA. EPIGLOTTIS LARYNX- LEFT PLEURA CA VITY \ BRONCHI ALVEOLI DIAPHRAGM Fig. 115.—Diagrammatic representation of the human respiratory system. The wall of the thorax has been removed and a portion of the left lung cut away. (Partly after Sobotta: Atlas and Textbook^ oj Human Anatomy, jiublished by W. B. Saunders Co.) exercise the oxygen demand and the carbon dioxide output are increased. The rate of inhaling and exhaling is controlled by a nerve centre located in the medulla oblongata, the most posterior region of the brain. The increase in carbon dioxide output and the oxygen deprivation during exercise alters the blood chemically and thus stimulates this centre, which in turn by stimulating the proper. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Buchanan, James William, 1888-. New York, London, Harper & brothers
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