. Human and comparative anatomy, physiology, and hygiene . the heat of the coals in his furnace. So, in thehuman system, there are organs that act like bellows tokindle the spark of life and produce warmth. Theseorgans are called Lungs. Q. To what may the lungs be compared ? How do the lungsresemble a pair of bellows ? THE LUNGS.* 93. The lungs are placed in the chest, and enclosed * Illustrate this lesson by using the trachea and lungs of a pig, sheep,caif, or beef with outline plates and the blackboard. 40 ANATOMY, PHYSIOLOGY, AND HYGIENE. by a thin membrane called plcura. This membrane also
. Human and comparative anatomy, physiology, and hygiene . the heat of the coals in his furnace. So, in thehuman system, there are organs that act like bellows tokindle the spark of life and produce warmth. Theseorgans are called Lungs. Q. To what may the lungs be compared ? How do the lungsresemble a pair of bellows ? THE LUNGS.* 93. The lungs are placed in the chest, and enclosed * Illustrate this lesson by using the trachea and lungs of a pig, sheep,caif, or beef with outline plates and the blackboard. 40 ANATOMY, PHYSIOLOGY, AND HYGIENE. by a thin membrane called plcura. This membrane also lines the chest. (Fig. 24.) Q. Where are the lungs situated ? What encloses the lungaand also lines the chest[ Remark. — In pleurisy, this membrane is the partdiseased. Q. What part of the chest is disease^ in pleurisy ? 94. The lungs are yielding, porous organs, and willfloat on water. For this reason they are often calledlights. Their color is a pinkish gray. (Fig. 24.) Q. What is the structure of the lungs ? What is their color1? Fie. 24. Fig. Fig. 24. 3, 3, 3. The lobes of the right lung. 4, 4. The lobes of theleft lung. 5,6,7. The heart. 9,10, 11. The large blood vessel trachea. 15, 15, 15. The diaphragm. Fig. 25. 1. Outline of right lung. 2. Outline of left lung. 3, and trachea. 5, 6, 7, 8. Bronchial tubes. 9, 9. Air cells. 95. Each lung is divided into smaller portions calledlobes. The left lung has two, and the right lung hasthree, lobes. (Fig. 24.) Q. How are the lungs divided ? THE LUNGS. 41 96. A large tube extends from the mouth to thelungs. It is called Trache-a, (windpipe.) (Fig. 25.)Q. What is the trachea 1 Fig. 26. Fig. 27.
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