Diseases of poultry; their etiology, Diseases of poultry; their etiology, diagnosis, treatment, and prevention diseasesofpoultr00pear Year: 1915 Diseases of the Respiratory System 149 ventral side of the neck, while diverticula from the large sacs are embedded among the muscles and even penetrate some of the bones. These sacs function chiefly as reservoirs of air. Some aeration of blood takes place in the sacs and they also help to reduce the relative weight of the body. The air sacs are the elastic or bellows-like portion of the respiratory appara- tus. The lungs, on ac- count of their stru
Diseases of poultry; their etiology, Diseases of poultry; their etiology, diagnosis, treatment, and prevention diseasesofpoultr00pear Year: 1915 Diseases of the Respiratory System 149 ventral side of the neck, while diverticula from the large sacs are embedded among the muscles and even penetrate some of the bones. These sacs function chiefly as reservoirs of air. Some aeration of blood takes place in the sacs and they also help to reduce the relative weight of the body. The air sacs are the elastic or bellows-like portion of the respiratory appara- tus. The lungs, on ac- count of their structure and position in the body, are permanently dis- tended. During inspira- tion the air passes through the trachea and lungs into the sacs. Fresh outside air is thus brought into the portion of the lungs where the blood is aerated. During expiration air from the sacs is forced back through the lungs. The current sucks out the air from the blind ending tubes and to some extent supplies comparatively fresh air in expiration. Thus the respiratory apparatus in birds is more efficient than in mammals, where fresh air is never available for the aera- tion of the blood, the entire process being carried on by residual air. In addition to aeration of the blood, the respiratory ap- paratus eliminates most of the waste moisture of the body and is, therefore, the temperature regulator. In mammals this Fig. 27. — Ventral surface of the right lung of a fowl, injected with wax. (From Gadow, after Stieda.)
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